Well, if this version does indeed play better, then I could of course add it to CB-Emu, e.g. as 'Delta-1 (modified)'.

But before doing it, I'd have to know the correct address mapping:
Is it (as for the original ROM)
map(0x2000, 0x20ff).mirror(0x1f00).ram(); // A13
or (like 'hap' posted for your 1st hack)
map(0x2bc0, 0x2bff).rom().region("maincpu", 0x0880);
map(0x2c00, 0x2cff).ram();
(or again something else, since you've changed the ROM once more)?

Regards,
Franz