I time the annealing to about 2-3 seconds after the 750F tempilaq melts but cut it shorter if the neck starts glowing (in a dimly lit room).
I use two sacrificial cases to experiment, then I write it down.
The flame intensity is important too. I like to keep it low.
Same here!
I use annealing cups that I made calibre specific to try and keep the heat concentrated in just the area its needed and also do my annealing in a dark (ish) room. I dont use tempilaq but just look for the slight glowing of the case neck-if it goes to cherry red then its a scraper. I let mine cool naturally as I had varying results when I quenched a batch or two.
A little bit of practice on a couple of scrap cases pays dividends. MAP gas seems to work better than standard propane as well.