Finally hit just over 45 MPG!
when I was getting 43MPG max I adjusted the floats to what I measured first as 17mm from a measurement of 16mm. Then my mileage went down a little more.
Checked and adjusted the floats and found they were between 19-20mm.
I put them back down to 17mm and I have no noticible stumble at 2000-4000 RPMs. I can cruise at 4k easily.
Also: 1 shim and 2 turns on the A/F with stock pipe.
Now if I can just understand if my traveling mostly >70 MPH is the reason for hitting a max of 45 MPG, I would be satisfied. If I should get higher mileage at these rates of speed I will need to continue looking.