RE: Idle Dipping
Another advantage to a properly set low end is that starting is much easier and more reliable. I find that once I get my engines correctly tuned, I can normally start them with just a quick backward flip of the spinner nut (don't even have to touch the prop).
Most engines are very sensitive to small changes in the low speed mixture. Make adjustments of 1/8 turn or less until you get a nice smooth transition on the punch test, a very slight rise on the pinch test. You'll also find that your reliable idle speed will drop as you get closer. Target a reliable idle speed about 2750 rpm.
A few minutes spent on the ground getting the tuning correct will save you hours in the future, and deadsticks will become a rarity.
Brad