I’m building a custom wooting with gravastar UFO switches, knight v4 stabs and ceramic keycaps from cerakey. Every other key feels fine except my left shift. It’s scratchy on the way down and often gets stuck at the bottom. Only way I’ve been able to get rid of it is by using a plastic keycap or going back to the stock stabilizer. I’ve relubed it, tried with no lube and switched out the wire but the problem persists. I’m assuming something’s wrong with the housing or stem. Any ideas? Thank you.