If you can get your converter rebuilt, not an "exchange unit", that might be an option. At the very least, get your existing converter flushed. In the rebuild, they'll open it up (at the weld seams) and should replace any bushings/bearings that are wear areas. AND get some sort of manufacturer's warranty for what they do.
Or if everything seems to be working fine, the trans has been serviced somewhat regularly, then a basic flush might be the minimum to get done.
Getting into the aftermarket can do more harm than having the bragging rights of having the particular brand of converter AND its stall speed. For what you're doing, no need for that stuff, by observation.
Just some thoughts,
CBODY67