once again trim is on aircraft to ease pilot workload.....so you don't have to constantly hold a stick position......
Now when I have full power selected I am taking off, or trying to climb...why would you want to trim that out then have to constantly hold back pressure on the elevator at slower airspeeds...after all when your slow your generally trying to descend...but you want to hold up elevator.....
after you have CG in the recommended range the best way to fine tune CG is in flight....Roll her inverted at 3/4 throttle or more and see what she does if she climbs then its tail heavy..if it requires more down elevator than you want to hold then it's nose heavy...now you want to hold a little down elevator while inverted how much is up to you....
Ladies and Gents I wish you all Good Flyin