I really appreciate all this advice, and I will be posting to those forums as suggested. I'll go ahead and take down the return edges and for now keep on trimming (super carefully) my other pieces before I start custom sizing to avoid trimming anything else too much.   @troopermaster indeed I trimmed to the red line instead of the blue. At some point I should have stopped trimming from both sides equally, and started taking from the bottom more.   My kit is an Anovos, and I'v