Gasket DIY for housing

Struggling a bit here with the last part of my build puzzle. Specifically getting a good seal between the nose cone and the rest of the housing on an under board build. Tried a bunch of design iterations. My first path was designing custom fitted gaskets in foaming TPU but they don’t seem to great good surface seals. Next up was gasket maker, but imperfections on facing surfaces seem to let water in. The closest I’ve gotten is gasket maker surfaces with an EVA gasket. EVA on its own wasn’t great either.

Anyone have any tips or insight here? Everything else works great and this is the last part of the puzzle that I’m having a hard time finding a good solution for.

2k Wagnersil silicone. I print the sidewalls of a mold in position, leave it on the print bed and glue an acrylic board onto it.