If you retard your base timing it will be retarded (

) across the board. That shouldn't be a problem on the low end.
I don't know just throwing out ideas. I am going to finish my MR2 and take it for a test drive by Monday. Then it will be on to tuning. Then I will be able to experiment with my own booster.
By the way, how are you measuring you production? I have access to all kinds of measuring devises and was debating a flow meter (yes i know how to compensate the reading to account for the differences in gasses) or using a beaker and stopwatch.
yikes - love your lab.