Great thread! Here's my two cents (and some of you may ask for change!):
I ran martial arts schools for a number of years. I instructed student to work on mastery of form, FIRST, then to build power and speed incrementally. Shooting form, like martial arts techniques, is key to not only the success of the practitioner, but also to the long-term physical condition of the practitioner.
So, my recommendation is to perfect form with as heavy a poundage as you can effectively shoot, THEN work gradually to increase that poundage (rather than settle for a lower poundage as "top end").
Apologies if this seems ridiculously simplistic.
Kingsnake