Follow the POH.
period.
You may think you know more than the manufacturer of your airplane about physics, weather, etc. etc., but I doubt you do, even if you have a PHD in physics and/or weather, the manufacturer probably had several people with PHD's involved with many decades of combined experience involved in the development of the POH.
Besides the notes about always doing it the exact same way, so that it's ingrained, there's the liability situation, and a level of comfort in knowing that if you're at X stage the controls will be at Y. If not, you know something is wrong. There's the fact that someday you may be flying in different conditions than you do at your home airport in the middle of summer when this student learned what to do with the controls. Additionally, having the carb heat on fully is a reduction of what, 50 RPM, but having had to use carb heat on a few occasions I can tell you that with the carb heat off, you lose much more than 50 RPM.