Are they all steel, or are the "sticky" ones polymer?
A little mag wobble is pretty common in the WASRS ( both of mine have a little) but as long as the function is not affected it is not a problem; If you have steel mags that fit well, but with a little wobble, then I would stick with those; if you open the well up more to accommodate the mags that don't fit , you will increase the wobble for the ones that work now.....shave the mags if you want.
But the rifle, I'd leave it like it is.