I expect to buy a Bowtech Extreme VFT. I' m not sure whether to order the 60# or 70# limbs. I could easily shoot the 60" bow maxed out at 60#, but would like to shoot about 63-65# now and possibly more in the future. According to Bowtech' s specs, you can adjust the weight down approximately 10#. My question is, will shooting 70# limbs cranked down to 63# adversly affect the performance of the bow? Will the bow shoot better cranked up to the rated weight of the limbs? (i.e. will a bow with 60# limbs maxed out at 60# shoot faster than a bow with 70# limbs cranked down to 60# or will they shoot about the same?) Also, are there any other considerations that would affect performance shooting a bow less than the maximum rating of the limbs (i.e. more vibration, hand shock, etc)?

Any advice would be appreciated-
Paul