Put them where they feel comfortable to you and the bow shoots well, that is what they are there for. Many will say the bow is more effecient with the limbs bottomed out, I have yet to prove this with any of my bows, they shoot pretty much the same no matter where they are set to as long as the bow is tuned. I use the limbs to match the spine of my arrow (which is actually why they are adjustable I think).
According to your bow warranty the limbs should be set within the specified range. Many bows will go beyond the specs both upper and lower. Some by as much as 7 or 8 lbs. If you have 60-70 lb limbs and you crank them down and it pulls 74 that is fine and dandy, but don't be shocked if the company doesn't warranty it when something breaks. I will add that I have never heard of this happening though. Most companies have pretty good warranties and stand behind them, often going beyond the policy just to make someone happy. But keep in mind, your limbs were designed for 70 lbs, not 74.
It should explain adjusting the draw weight in the manual, I would go by what that says. Keep in mind some bows have locking screws that need to be loosened when you adjust the limbs, make sure you check for this before wrenching on it. And more important that bottoming the limbs out on the high side is knowing the limmit for decreasing the draw weight. This is where it gets scary. If you turn the limb bolts out to far they can strip the threads and the bow will come apart[
]. I've seen it happen, not a pretty sight.
Paul
Tightening the limbs question?
