I think it would really help you to shorten your stirrup a hole or two for hunters. Although your leg takes up the saddle fine, the stirrup bars in hunt saddles are placed further foward to accomodate for a shorter stirrup (believe me, I know- I have the opposite problem because my legs are so short that many saddles just place them way to far foward).
I think a lot depends on the horse's stride too. I am small (just under 5'4" and relatively thin) but don't really like riding small ponies because of the short, choppy stride. However, my new horse is a 14.3 hh arab and he has a huge stride so rides much bigger than he is....seriously, he strides larger than many 16h horses I've ridden!