Centerpointe has a lot of research on holosync, google it and all sorts of stuff will come up.
As far as the science of PLs, the most info I have personally gotten is from the accelerator coaching cds. As I've said in other posts I feel the accelerator is worth the price just for the coaching cds alone!!
Its hard for me to relate to the way you think and the questions you are asking...my mind doesn't follow that track at all. I usually take the stand that the proofs in the puddin!! lol
I like to know what kind of person I'm dealing with when it comes to personal developmet...I never questioned as to wether or not the suggestions were on the up&up. But being around, learning more of the products, paying attention to (pauls)peoples backgrounds...has me convinced that our (as individuals) own growth is what is important! However it may come.
Dan