thanks I managed to find the problem on the pg patcher discord
FYI there's some confusion on what gamma settings should be , people with the experimental build of CS and linear lighting should try gamma at 2-2.2 while people on the release build should have 1.4 if they're having lod mismatch.
They can then tweak the LOD blend setting. Setting gamma at 2.2 produced very nice LOD for me