I've been shooting off our "sled" with two bags of weight on it. I'll try no additional weight and see what happens, as far as the felt recoil. I want to try that, as I don't understand how less weight on it would be beneficial, but will try it.
One thing I do know, is you best be shooting with a good scope with great parallex correction, or you're gonna have lots of trouble. To get up on the scope like I should when shooting off the "sled", I'm like a monkey on a football. Distorted, and totally out of a Real comfortable shooting position. That may be just me, however. It does reduce the recoil noticeably.