I can certainly see that TSR being about as small as you can go with your combo.
BTW, I use 10-32 for the T slot restricters. I know some guys use 8-32 but I’d put need bigger than about .078ish (IIRC) the drill gets into the hex of the brass.
Agree. I'm using 8/32 and the .081 is max for me when center drilled. I would need to go with the 10/32 to go bigger. I'll add that the TS diameter change is very sensitive, .076, .078, and .081 are big steps.