At high percentages and volumes, things can get colder instead of hotter at idle so you need to make some heat first. However, at low percentages, you'll just want to change over right away because it'll behave like it's hot methanol. It'll make heat on 20 or 25% just like running properly adjusted on methanol. At an idle, 350-450F is a good temp to shoot for. Going down the track, 1100 to 1200, same as methanol.
Yes, at low percentages, properly tuned means a bit leaner due to the AFR and specific gravity changing at different rates.
.005 per step at that size pill (120) is a great place to be. Richen it a step or two, make a pass or two, observe plugs and temps, lean a step, repeat.