GeGeGe to Dropzone problem

[Virtvic]

I recently took a Bandai GeGeGe cart and made it into a Dropzone.

Game booted and played, but with graphical corruptions. I noticed the cart pcb had a non used H and V jumper, so I traced them to the diodes and removed them. The graphics are now 95% there. I just have a bit of corruption in the score line.

Any ideas how to finish this off?

I used 27C512 EPROMs wired directly to the cart pcb.