VKB-SIM

I recently purchased the Gunfighter Mark III desktop version with MCG Ultimate grip. Out of the box I got pretty good but not perfect centering on the X axis and terrible inconsistency in centering on the Y axis. I replaced the Y axis cams with the H version and replaced the factory installed #20 spring with a #30. It now centers on the Y axis quite well, but with the hard "bump" at center. I'm wondering if someone can tell me what the minimum spring strength I need to get good centering with the soft center cams. Since this is a desktop model I don't want to use really stiff springs. I'm using the AVIA version of cams.

I would suggest to put back the #20 springs and add a #10 on each cam. See how it centers and adjust the rest from deadzone. If deadzone exceeds 2.5 then put #20 springs instead of #10s. Here's a video about adjusting the base. Be careful how you'd tighten up the cams' bolts (neither too tight or too loose won't do).

I use 50+50 on both axis with 200 extension.. its centers quite well..

Have you made sure the dry clutches are fully loosened? I know that they used to come tightened from the factory for transit.