Glad things feel better - this makes me think these coils (and possibly all the "D" models) are getting 10-20% more dwell time than they need. Or in other words the dwell limiting which is what my tables are based on, only comes into play well past ideal dwell. Did your stuttering when blipping the revs up improve with more dwell or less?

When I get the dash buttoned up and can get mine back on the road I'll try to make some time to try some cell interpolation.

Multi-spark shouldn't add significant cpu overhead. Once I have some basic interpolation working I'll start thinking about the simplest way to implement it. Offhand it shouldn't be much of a challenge. I'm just not very optimistic because the OEMs aren't doing it (as far as I'm aware).