Need help tuning AED carb

OK. Did some more tuning today. The 4 corner idle on this carb is super sensitive, move it a little and it changes a lot. I now have it idling in the high 13's. I am comfortable with that. I now need to concentrate on cruise situations. I am cruising low 12's. That is around 55 mph and around 2400 rpm. Tach is inop at the moment, just guessing from memory.