No, if you need a bigger than the Canon width of 20 that`s ok - for all levels of approval....I would however try and avoid going bigger than 25 though. Here`s how I did: I trimmed the rough edges of the thighs and using tape overlaped the front so the raised edges were 20mm, then butted up the the back (also rough trimmed, only removing the flashing) and taped that up, sliding the thighs on (with undersuit), checked the fit and needed to go bigger so ended up with a 22mm coverstrip (front and back, I wanted the strips to match), also trimed as much that I could from the upper return edge, more from the inner part than the outer to maintain the illusion of thickness. I maxed out on my thighs so the back has a gap at the top so to strenghten the joint I used a small inner strip at the top. The Anovos suit has pre-cut (at least my shadow did) strips so that makes things more challenging, idealy the strip hides the raised edge but there`s room to "cheat" a little meaning it`s fine even though if a few mm is showing - keep going Fredrik, you`ll get there in the end
RS suit for reference