Thanks much. Ive gotten it shaving sharp in past. Will spend 3 minutes per side gently
With the Benchmade knives I've had, their thick factory edge geometry gets progressively harder to keep as sharp with subsequent resharpenings. It starts out OK when brand new; but the edge retreats up into thicker steel as the edge is resharpened a few times at the existing factory angle. So behind the edge bevels, it keeps getting thicker than it started out, which makes it even more challenging to keep it shaving, unless some of the steel behind the edge is thinned away. Always the same 'fix' for all of mine, which is to keep thinning it a bit more over time, behind the edge, each time I resharpen them. In other words, take the angle just a bit lower each time, taking some of the shoulder off the bevels in doing so. Eventually the sharpness starts coming back to what I like in an edge, done that way.
Part of the added difficulty in sharpening, as the edge retreats back toward thicker steel, is that the edge bevels get progressively wider in the thicker steel, even while maintaining the existing sharpening angle. A wider bevel, having greater surface area, will inherently take longer to grind to a full apex each time you do it. So it takes longer and longer and longer to get to the apex, each time you resharpen. This is also why it does no good to count passes or time the sharpening, based on what it took to 'get there' the last time. Just have to keep going until you make a burr again. Setting the edge bevels at a lower angle will also take more time, for the same reason (wider bevels, therefore larger surface area). BUT, in doing so, the sharpness will greatly improve as well. So it's worth thinning it out, in the long run.