Gearing question

Here's the rundown on the evolution of my car.
1st trip to the track:
street tires that are 27" tall, 4.56 gears. 60' was 1.88, 1/4 mile was 112mph and 12.8 seconds. I spun pretty bad, was on 6400 rpm crossing line.

2nd trip:
I bought street slicks that measure .75" shorter than street tire. Same gear. 60' is 1.58, 1/4 mile was 107 mph and 12.3 seconds. I crossed the line at 6500 rpm.

I am thinking I need to change gears to be 3.90. The car is a 440 w/727 trans, 3400 stall, holley HP750, M1 intake, eddy heads, 9.2:1 compression, mopar 284deg .539" lift mechanical cam, TTi headers. I had hoped the car would be in the high 11's but it has fallen short a little. I am thinking I need to change the gears to better utilize the torque of the motor and get the mph up and the ET down. Any suggestions?

Here's more info if you want it.
-timing is 25 degrees initial, 36 total
-jets are 80 front, 86 rear with the power valve plugged in rear only.
-valves are lashed at .018" I & E
-plugs are gapped at .032", and they read good as far as jetting.
-Went up 2 jet sizes and slowed down, went down 4 sizes to where I am at and gained 2 mph.
-use competition engineering slide-a-links. Leaves straight and hard.
-Could probably use a 950 carb, but I can't afford it!