No, she had never run clean to 7000 with boost. I'm going to pull the plugs and will take a look (probably by the weekend) and try to play with different gaps and see what it will do.
I am lost in so far as I know a few who had succesfully ran similar set up (engine/EFI/twin plug/wasted spark) without issues - variable being SDDS coils (I think they are GM one?) and the actual ECU. But then if the ECU is controlling dwell & its inductive, I can't see a logical reason why things are that different