wow cant believe i missed this section for so long.
Hey good work on the setup, I just did a setup not long ago with the same results in regards to changing where the ignition setup is taken from (ecu vs disti) works great here now.
As for your fueling problem, how good of a 12v signal is the smt6 getting? The smt6 is really picky and can have pretty crummy results if the +b signal is a bit on the weaker side and eventually can lead to a voltage drop off after the smt6 (which you are experiencing).
Never had that problem myself but others have from time to time and they just used the fuel zero calib to fix that (as you did)
Good work man keep on updating
I love the 6's they work real well.