Usually I set the elevator trim to neutral and the cg verySLIGHTLY in the positive angle. Like Mr67Stand says, it's much better to have a climbing plane than one that wants to dive. I say set the elevator neutral and cg slightly up beacuse from my experience ( 22 years ) 9 out of 10 times the plane will want to dive if the cg is spot on. Once you gain experience this topic won't be all too important.

Good Luck...