The GP instruction manuals are generally right on the money. I'd go with those throws. The last thing you want is a trainer that's all twitchy and easy to over-control.

I maidened an aerobatic plane last week using control throws that "looked right". I had way too much aileron and elevator on low rates. The first minute or so of the flight was pretty hairy. You can always change them down the road after you have some time on the plane.