I'm not 100% positive, but I'm pretty sure that L1 SHOULD be mostly working for you, but will give you a credit dot since it will look for a switch that you don't have (assuming you have a normal production game). It should still divert happily (I think ).

I'd say step one is to make sure that your switch/optos are all working correctly...especially the ones on the ramp that will trigger the diverter. I know you said the diverter is working fine with L7 ROMs, but check anyway. L7 might be automatically tripping the diverter after the second virtual lock, not depending on the switches only...so it could be a "compensation" thing built-in. I'm really not sure on this, but it sounds possible!

Step two would be make sure you don't have any trough issues (divots and/or opto problems). You will have to do these two steps anyway (as well as planet/crane alignment, ball drop perfect, etc) to make the "mod" work right, so might as well do them now.

THEN contact the good folks at Pinbits and get ahold of L1AT. Or of course you could start with L1AT and that might solve it all, including the phantom credit dot that L1 causes on production machines. But be warned, if you have any opto or trough problems, the mod will cause wackiness to happen. I have a feeling that your problem is more than just the ROM, but who knows.

Good luck and keep us informed.
Chris