The "centering" force feedback has a really big dead zone, is this a issue with LFS or the settings of my G25? Any tips on how to fix this?

It's programmed into the Logitech drivers to prevent oscillation. Try setting the FF strength to 105% in the drivers (and everything else to 0%). In LFS I use something like 40-60% and it feels fine to me

I've kept the default 100% FF in drivers, spring etc. at 0%. In LFS I set 20 and it feels good.