Some pics to illustrate the previous post:
The 2 blisters show where the majority of knives with a heel and a palm swell and belly create hotspots because those are the 2 areas that resist the knife sliding forward, in addition to the index finger at the bottom of the handle belly.
On the Fehrman and the BK9, the handle is so short that the little finger is constantly in contact with the heel. In addition, they do not have a palm swell at the top or a belly at the bottom so the little finger takes the most pressure when the knife slides forward or rocks in the hand at the top of the stroke. Once your hand hurts, you cannot move it forward to avoid the heel. Lifting the little finger out or putting it behind the pommel is the only option. In fairness, the Fehrman did have a sub-hilt that I had removed but for me it caused more issues than not. The scales also did extend further down the heel and I had that removed but only because they ended in sharp points so they actually hurt more than helped. I don't know whether to remove the heel or put on thicker, contoured scales that extend all the way down the heel and round that area.
The heel on the Becker is wide but the tang is is not flush with the scales so the thin tang pressures the little finger. There is no palm swell at the top and very little belly at the bottom so like the Fehrman, the forward motion is arrested mostly by the little finger. The Becker scales can be moved but if you align it in one place it mis-aligns in another so there is always some ridge at the top or the bottom, rear or front.
The Becker handles are thick and nicely rounded though so they distribute pressure well in the V between the index finger and thumb, provided you align the scales with the tang.
The Fusion and BWM handles use the same design concept, a sloping rear, a palm swell and a heel. So the forward motion is arrested by the index finger at the front of the handle belly, the V between the index finger and thumb, and the little finger, with the latter feeling the most pressure. The rear part of the palm is on the downward sloping handle and the middle two fingers are on the round part of the belly so neither of those two areas resist the forward motion, except for what I would consider negligible friction relative to the other 3 areas mentioned.
The scales do not extend all the way down the heel so sometimes the little finger presses only against the thin tang / heel, especially when the knife rocks in the hand at the top of the stroke, forcing the little finger further down the heel.
The handles are longer so when the little finger starts to hurt, you can move your hand forward but then the index finger and V has to provide the arresting grip so that works for lighter knives and very sharp knives that do not need to be swung too hard.
The top of the handle, where the V between the index finger and thumb rests, is too thin on some knives, not distributing the pressure well enough and some are too square, putting all the pressure on the 2 corners.
Magnum scales (contoured handles) also provide surfaces on the side of the scales to arrest the forward motion somewhat with the front section of the palm and front digits of the index finger, rear side of the palm and front digit of the little finger.
The absence of any, few, or a single slope to arrest the forward motion of the knife, as in the DSSF, with really only the front of the belly providing that, makes it very hard to chop when the hand cannot grip it tightly enough, like with slippery gloves as I experienced.
Here are some design elements of handles that I find very comfortable.
The Chopweiler slopes upward toward the rear on top of the handle and slightly less so at the bottom. That means that the palm of the hand provides the bulk of the force to resist the forward motion of the knife. The palm is soft so it does not hurt. The very slight slope on the bottom of the handle means that all the fingers provide almost equal resistance to the forward motion and the grip pressure is on the softer inside of the finger, not the rear side where there is less padding and it hurts easier and more. Depending on your hand size and finger length you can move your hand forward and backward to where you find it comfortable.
The SAR 8 has the same basic concept but the majority of the forward movement arresting slope is at the bottom, not both sides as on the Chopweiler. But you can also move your hand to a position you find comfortable. But the Chopweiler and the SAR 8 are thin at the top so do not distribute downward force in the V.
The Benchmade 171 uses the side swells at the rear to arrest the forward motion against the soft rear of the hand, and the first digits of the fingers and also with a rounded heel and full length scales, not exposing the heel, therefore distributing the pressure along the finger and rear part of the hand. It does not have a palm swell at the top but has a belly to provide some grip for the index finger and contoured scales with a gentle rearward slope, not a bulge, to provide some grip for the front section of the palm and front digits of the index finger.
The top is wide to distribute the downward pressure in the V.
As I already stated, I also find the B10 & B11 handles comfortable but I need to analyze them more to understand why. The only thing I have learned from them so far, is that I seem to like thinner handles for fast, snap cutters. The grip afforded by a thinner handle seems to loosen my wrist for a snapping action more than a very thick handle where I cannot close my hand around it properly and allow it to rock in my hand. But again, I need to do a lot more testing and thinking about this before I understand it enough to comment conclusively.
Well, I have certainly repeated the same things too many times now!