If I was to take the carb heat off any sooner
Well if it's base and final you want...
After carb heat OFF late downwind I look for my turning point.
LOOKOUT
Turn base
carb heat on
power idle
hold altitude to bleed speed
flaps set 1 stage
trim back on wheel 3 times for 70-75 knots
1500rpm
LOOKOUT
Turn final.
Stage 2 flap as required.
Carb heat OFF at 300-500ft
Everyone's got a different way of doing things.