S.C.Hunter,
Years ago I felt the same way, a 64 inch bow was as long as I was going to go ... just too crazy long!
Well, Finger pinch issues for my 29 and a bit inch draw forced me to try a 66 inch bow. It felt like I was talking my .54 caliber long rifle to the woods with me. However, with practice I learned it did not bother me at all. I shoot 66 and 68 inch bows in heavy timber and CRP ground. I mostly sit on the ground, but I do sit in a tree once in a while and stalk a lot. With practice, the length of the bow does not bother me at all in the field ... it bugs me the most just getting in and out of the house.
I shoot better, have more confidence and it feels better on my body having the extra length. I am not concerned about the extra length in the field.
Lastly, you are talking about an inch or inch and a half at most difference between the limb tips. Put your bow (64 inch) next to a 66 inch and line up the risers. There is little difference between how the limb tips line up.
Good luck to you.
Bob.