""The 88 jets now have the IN GEAR AT IDLE A/F at 16.0 to 16.8""

The jets do not control the In Gear Idle A/F. You are lean on the idle/transition circuits which consists of the Idle Air Bleeds and the Idle Feed Restrictors. The jets will affect the A/F further up the rpm range (cruising speeds)depending on how the carb is setup, not in gear at idle. You need to forget about the jets and concentrate on these two circuits before you burn up your motor. Once you get the idle circuit a little richer, then you need to concentrate on getting the off idle and low speed cruise richer too. Then once you get that under control, then revisit the main jetting.

""The gas here is "Up to 10% Ethanol.""
You may want to aim for around mid to high 13's at the in gear idle with E10.