ORIGINAL: Jim Thomerson
If it is not cornering and turning tight enough to suit you, I'd suggest moving the GC back 1/8 in at a time. If it starts getting squirrelly on you move the leadouts back as well. The whole secret of trimming is to make small changes so you don't mess things up and have a repair job to do.
Jim
One inch from the LE sounds a little nose-heavy to me. But I don't have Twister plans handy to check. Jim is right on-move the CG back a tiny bit at a time and see what you think. I don't think it matters whether you check it right side up or inverted. Do whichever is more comfortable. Some builders include a weight box or some way to attach weight to the tail for the purpose of trimming the CG.