my solution for future googlers, ensure you have a 3D injector dead time table if you are running a vacuum line to your FPR, if not, keep using the 2D injector dead time table with the FPR vacuum port OFF (only if you're naturally aspirated) to use the base fuel pressure you set (43.5psi)
The oscillation issue can be due to the closed loop gain control table having too high of values, making it too sensitive, and overcorrecting too fast.