Not sure if it is possible, but see if you can try & lay back the chamber wall on the spark plug side on the long turn radius side to help improve airflow.

If you have any junk heads to play a round with. It helped on my 12 port head, I know, different animal, but worth experimenting with.

Before a little tweaking.



After some massaging.



MBHD


12 port SDS EFI