i have the khoalty lenses as well; also replaced the gaskets.
at least on mine, the replacement lenses fit incredibly tight.
i noticed on mine, too, when replacing the lenses there were almost two levels of compression. at first, the lens fit, but not tight. i then wiggled it some more and all the clips came down much more tightly.
i've been beyond happy with mine - been in a couple of large downpours and no issues here.