I have short legs (ride a Small Giant and never taller than a 51 cm frame) and I ride 175's. I used to ride 170's all around - mtb, road, track. Now I have 175's mtb, road, tandem (haven't touched the track bike in a while). I tend to spin till I'm suffering then I push (doesn't everyone?). My strength is sprinting, I can't climb or TT to save my life.

My thoughts on cranks:
http://sprinterdellacasa.blogspot.co...m-lengths.html

Basically I would save significant ergonomic changes for the off season. Significant = crank length, perhaps shoe or pedal swaps if they are radically different. Anything to do with your hips down. bar, stem, seat, etc are not as significant and easy to change back.

hope this helps
cdr