The question is,
is feathering it on 3.73s faster than basically smashing it and go with 3.31s ?
Dont fear the gear!
BUT, take some things into consideration, Time spent at highway speeds, and how you are effected by MPG. As far as traction goes, When you go to get a new set of tires, how about some NT05 NON DR's They seem to be a fair price and look like a decent tire. Anyways, Plan for the future, you will be kicking your self in the butt if you dont get the gears because of the tires you have now, when you get your new set of tires on there and realize those new gear would go great with a bit better tire.
I will be stepping up to a 3.90 or 4.10 in an AUTO, but the car is a shop car so MPG and highway speeds are not an issue.
Glad to hear the tune is running good.
Chris