Custom-made should give a better fit, as it`s made to the shape of your head from the template you provided... the problem you are having now is not uncommon with stock systems..they are fine in many ways, but you are limited to a medium density and 2 sizes of base... custom-made will have ``Darts`` put in it so that ripple you are now getting should not occur....I think French lace is a little more prone to it than Swiss, judging by what I`ve read.... others may disagree?
....`Darts` are folds in the lace which give curvature to the base so it fits your particular head-shape.... I`ve taken 2 pics of an old system so you can see them...on the 2nd pic you can see where one has started to `lift`a little... as far as I can see, they simply fold the lace and somehow `fuse`it in place probably with a strong/`permanent`glue as I see no stitching which would be obvious if they had cut the lace...it would obviously need to be stitched... hope that`s of interest/help.... Paul.