Lager,
About whether putting pressure on the buttstock is a good or bad thing: it all depends on the gun. Right now I'm shooting a full-blown Suhl Benchrest gun and I'll tell you, it doesn't matter whether I'm using my $900.00 customized Hall One-Piece rest, or my $1000.00 customized Randolph Machine Two-Piece set-up, I still find that if I don't lean right into the gun I'm throwing shots all the time, and sometimes for as much as 2 points per shot. But, when I pay attention and remember to lean in they all basically stay within the 10-Ring.
Now, with the Suhl I had before this one, which was pretty much the same gun, only different, I only needed to put enough pressure against the Butt to be able to barely feel the gun through my clothing. And with that gun it wasn't a matter of whether I was shooting 9's or 10's, but rather if they were 10's or X's. Yup, that was the gun that got away and I should have never agreed to sell her. My best Agg when shooting IR 50/50 Unlimited was a 748-55X with the second and third targets being back-to-back 250's with each having at least 20X's. It didn't take long to realize what I fool I was!
Anyway, good luck, and enjoy your learning experience as you figure out what your gun likes.
Dave Shattuck
P.S. I too started out shooting Benchrest with a Model 82G, and loved it so much I still have it, and only have good things to say about its potential. I just can't bring myself to part with it even though I've been offered good money for it. Maybe now I'm once again showing my foolishness?