vector001,
I would be concerned about the ability to swing the tomahawk EFFECTIVELY once the length got much past 2 1/2 - 3 feet!!!
Have you tried them out (chopping/hacking/sticking in a wooden target while holding the shaft)?
I would think that the most effective 'moves' when the length is 3 feet or longer would be spear-like jabs, and the head is at the wrong angle for this...
well, you are right i think ...my favorite length for a hawk is in the 28 - 32 inch range with a light head.
the hawk is so low mass that with the flat hatchet side of the handle, it is pretty easy to control.
it was built with a woman or young man in mind (as a possible user), and they like it so far.
i use varying-modulus slurries in the composite, so the handle has very little feedback - the handle is actually my tomahawk-length handle that i like to make, times twice the length - since the hawk handles are overbuilt, the staff-lengths have done well so far - i am always up to improving where i can though, brother glock...

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as to "moves" ...well, every buddy's different ...(wink!) ...like i noted, with the low mass of the thing, anyone dumb enough to get within four feet plus the length of your reach is going to have a big surprise. - i love these low-mass hawk heads becuase you can use them all day, including on adversaries.
also, you'll notice i have a bolt that connects on the butt, which can be used as a spear point in extremus ...

... or you can bolt hoes, real spearheads, shovels, or whatever on there ...crude so far, but its a learning process, fellow-babies ...

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this hawk is a hiking staff first ...a pretty tough one compared to wood, and lighter probably...;
if i encounter a feral dog pack, or someone who wrinkles their nose up at my side of the fence, the head will do its part just fine.
the handle alone will beat Jesus into anything ...so the head just adds to the merriment ...hehehe...!
and i can gather some fire wood to take the chill off the old bones....
what really matters to me though is THEY ARE FUN AS ALL GET-OUT.
....har...!
all that said, i hope to have takedowns soon, so folks can try out any length, any time, but with only one hawk.
excuse me, i got a tee-time for some gopher golf....
vec