Generally speaking, a longer bow will usually be heavier so I do not know if that would be the best idea considering your situation. Each of the companies that you mentioned however does make at least one reasonably long axle to axle length bow....Hoyt Protec, Parker ULPro....and PSE has several in the longer axle to axle length range category.

If the draw cycle is going to be an issue then I definitely would suggest soft cams or round wheels as opposed to hard dual or single cams. PSE and the Hoyt model mentioned both are offered with this design...as well as higher percentages of letoff.

Good luck and I hope this helps.