The converter for a street/strip car is like essentially every other part on a street/strip car.
It’s a compromise........ like the cam, carb, rear gear, etc.
Most of the time the decisions for those parts are based on balancing the cars performance with the drivability on the street, along with reliability and how much street use vs track use.

It often works out that chasing a tenth or two on your street/strip car can cost you a disproportionate amount of lost street friendliness.

As I said previously, and reiterated by Dave........ you basically want as tight of a 9.5” or 10” unit as can be had, and it will still have over 3500 flash(probably closer to 4000).

“If it were me”, I’d send the one you have to Lenny at Ultimate, have him cut it open...... and then have a talk about what can be done with it.

If it’s not up to the task of 600+ ft/lbs, and it fails......... that’s more problems than just needing a different converter.
It’s a trans full of metal.