Good advice on the airflow meter. I will try and improvise something, I have struggled balancing things out since one idle screw turned out to provide double the idle fuel with the other one turned in will still provide decent idle. Maybe I'll rig something up with two PC fans and a multimeter...
Good to know about the water! I got worried there for a second.
Only thing that confuses me is timing by vacuum. The manual calls for 7 degrees advanced. The engine will idle at higher vaccum if I advance more, all the way to 20-25. I think that is normal? One idle screw setting works better there than another, so I just assumed: Make sure RMP are right, set timing to spec, then idle mixture, then tiny adjustments to timing vy vacuum?