I have a pair of Atomic beta carve skis and both of them are concave in tip and tail but convex in their waist. Please have a look at these base photos, is the convex base in third photo normal? If not, what should I do to flatten the bases? I've heard horror stories about shops and I do the side edges and p-tex repairs myself already. Is there an easy way to flatten the bases myself so that I can do the base edges thereafter? I'd like to remove the dings once in a while but with convex bases this will be hard I guess. These skis are 2nd hand so I don't know their history. Anyway I don't mind screwing them as they're almost at eol.
Another question, I still need to purchase a decent base edge sharpening tool. Given the waist of less than 7cm, is the SVST Final Cut base bevel guide a good match or is it too wide for my skis?