Erratic Timing

Yeah no kidding right about now I'm thinking it would be nice to have a computer handling this! I haven't messed with the spring perches yet; I want to be sure of what I have first.

OK I checked the timing curve again with a more reliable person watching the tach and I got the line in orange – much more reasonable. Some of the points could be off by a degree or so, but I'm confident I'm very close this time.
Timing Advance.png

I still can't get the idle to drop less than 100/150 rpm going into gear. And if I quickly jab the throttle, after revving up the engine drops another 100 rpm before returning to stable idle. If I brake when doing that it stalls the motor. It just lacks power at low idle. I've tried all kinds of timing: 8*-18* initial with and without vacuum advance, but it doesn't seem to help. I cracked the secondaries because the cam needed more air (not enough to get into the transfer slots); maybe this is causing a lean condition?