Personally, I wouldn't mess with the servo linkages to the swashplate to try and trim the heli.

When I get ready to fly, I know it's gonna lean a little left and forward, so I adjust the trims a bit, get light on the skids to see what's gonna happen, then set it down and re-trim accordingly.

Concerning the earlier post about mounting the orange ping-pong balls with fule line...that works great. However, the tubing towards the heli (inner side side of balls) will have a tendency to slide and allow the balls to slide back and forth...possibly shifting your CG while flying. With the balls in the correct place and held firmly by the tubing, I put a drop of CA on the inner tubing.