Like I said, it's the challenge that makes it worthwhile...
Idle speed is more a function of prop weight than timing...A CD ignition will fire at 1 rpm, so if there's enough inertia the engine will idle as slowly as you want it to...Mine will idle at 1400 all day long with a heavy prop, timed at 28....And you're doing better than I am if you can tell any difference between 28 and 30 for top rpm.....
Hey, if I knew anything about electronics I would be doing it too...
I buy the boards and components, and if I solder all the little pieces in the right place it works..
Very well, I might add