Too much gear?

I think a converter guy will give you the best answer. But here is mine ;)
Whatever Highest MPH you get, go back and see where the rpm is after 1-2 shift. Converter should stall(launch stall) at that rpm. I said 4500 or 500 more because that is where it pulled back to after 1-2 shift.
The more info you can give the converter builder the more happy you will be with his results.

Gotta get out there and find some more answers...... or put it on a dyno this winter.