1. My standard GF recipe with sorghum and rice solids. Brewed it about once per month lately and has always been good.
2. Same as #1. Of course it's the only recipe I've brewed/shared so not like a lot of choices!
3A. Using half the fermentables at flameout makes all the difference in the potential off-taste.
3B. I can do the same recipe every time and each time it tastes just a bit differently.
3C. I go from fermenting to bottling. I have learned to be patient, waiting as close to 3 weeks before sampling.
3D. A tiny bit of yeast added at time of bottling seems to help with carbonation/head retention.