scale issue help

Hello,

i have scale problems. I am modeling a shoe. if I want to scale everything together, the proportions are no longer correct. the laces are too narrow. i used different modifiers. i tried different scale methods but don't find the solution.

i made the laces with curves, stitches array modi and parts with planes and solidify modi.if i set pivot point to individual everything scales wrong, if i set it to 3D cursor only the laces messed up, they have the wrong proportions.

i hope you can help me, thanks al lot!