Get on the pattern forum and read a bit on how to trim a new plane. F'rinstance, to check CG, fly a wings-level 45 upline. If the bird stays put on the upline without any elevator input, roll 180 and fly the upline inverted. If it takes little/no elevator to hold the upline, CG is good. If it takes down elevator (push), CG is too far forward. Opposite is true if CG is too far aft. That's just to fine-tune CG on a good-flying plane.

Trying to get the plane to fly 'like a sim' is backwards. Get a good-flying plane, and make the sim match it. Most sim planes don't match any real-world birds. They fly too easy, but that's what sells sims.

I'm amazed at the sport flyers who say they can 'feel' the difference between digital servos and analog. I can't tell the difference (using servos of similar speed) other than I can feel the difference in my wallet!