I may be wrong but just how much lack of power results from carb heat on versus off?
My Emeraude with its Continental C90 (apparently ice making machine) drops about 20/30 revs with it on, possibly less than that, I can barely see much movement on the dial.
It climbs out over trees on the 600 metre strip, no problem with carb hot, full flap, and over weight.
So I am in no hurry to blindly follow old wives tales passed down over years of " that's the way I was taught".
Yes the carb heat does work because I once picked up ice while taxiing on wet grass, carb cold, it was cleared in a few minutes using hot.
Perhaps this depends on the airframe/engine setup?