I just built a qav180 with a spracing f3 evo flight controller but it drifts to the right in angle mode. If I rotate the board it drifts to same side of board, so it's definitely the board. I have calibrated it 100 times on different surfaces with no luck. I can trim the accelerometer but then the machine doesn't pirouette flat. The only fix I have found is to take a shish kabob stick and place it under the side that drifts when I calibrate the accelerometer and then it hovers flat and pirouettes flat... I have same results in both betaflight and cleanflight. My other quad with regular f3 board doesn't do this. Am I missing something? Has anyone else encountered this? Spracing doesn't seem to have any contact information or support.

Trichome, I realize this is a while after your post, but did you ever solve the problem?
My buddy just got his SPRacing F3 setup (his is most likely a cheap clone) and he has the exact same issue.

The one piece of advice I got but haven't tried yet is to soft-mount the FC. Did you try that?