8 3/4 ring gear change for optimum low end performance

OK...this is where I need to give more info...I did brake stall test only today...I know...big dummy...I'll try to get a flash stall tomorrow. Working nights this week...sucks.
The converter does have an HS sticker on it.
Is flash stall typically higher than brake stall?
The car really runs great and seems to be timed very well but it def doesn't react anything like what your saying...yet anyway.
The OD and lock-up work great. OD @ 45mph for 10 seconds then lock-up following after another 10 seconds. Both on timed relays.