Is anybody know what could possibly cause of a wobble in a quadcopter?
I attempted to modify an MJX bugs 3 quadcopter (just taking the frame,ESC's, and the motors) take out the flight controller and change it with SP Racing F3 board with INAV. Stuck the FC to the frame using some double-sided tape.

The first attempt to fly the quad I noticed a really bad wobble. After reading some articles and watch some videos, people suggest that I need to adjust the PID. By lowering the P to 33 the wobble decreased significantly, but still, there is noticeable wobble occur.

Is there any bad impact if I lower the P even further? is there any other solution to solve the wobble issue without messing around with the PID since I don't really understand how to mess with PID?