Hi,
There's a reason the old blitter delay is still supported: there's a bug in the new "accurate blitter timing" code that isn't very accurate. We presented buffi (author of the new timing code) a few scenarios where the speed doesn't line up with hw, but it proved too difficult to debug the hw so deep into the game (where the problems lay)
In short, setting the blitter delay manually along with cpu is a much better option for CV-1000 super fans (hi el_rika!)
best regards,
- dink