RE: short bows, curves/lb
I've got an assortment of different bows, different lengths. A short recurve "buffalo" bow that's really fun to shoot and a "shorter" R/D longbow that is a nice shooter too...but, when time comes to hunt the 66" longbow usually gets the nod.
Pretty much a personal decision but I'd say if you're comfortable and confident with the 68" longbow then it can't be "too long".
It's kinda amazing how the extra length just doesn't matter much anymore. Guess I got used it.
Good Hunting