The timing curve we are running starts out at 15 degrees and advances fairly quickly by 21 to a total of 36. I am running the second quickest springs in the distributor, so it should be ramping up to full advance by 2800 RPM. That is close to the rev level I am holding at on the line before I launch. (I am not running a transbrake and may not be consistent in this area yet, could be anywhere from 2200-2800).
I will have to test the blubbery thing next time I take it out.
I´d try 20° or even a little more initial with a limiter kit for the distributor. From my experience engines will idle cleaner, maybe this will reduce your bog. I´d also check the advance curve with a timing light, there are many variables and i would not rely on what the spring kit instruction say.
Michael
