Hi Niltrog nice to hear from you again

To cover some of those issues:
The temperature question is possibly the only one that might be a little tricky (most of the important details are explained in post 179).

I'd avoid the water bath method if I were you (although I've used it successfully many times in the past, I've found that too many people are finding it difficult to maintain a high enough temperature for long enough), instead stick with the oven and you'll be fine as long as you remember to keep an eye on it and make sure it doesn't get too hot.

I'm comfortable with recommending gas mark 1 as the setting (275 Degrees F) as long as people are aware that if their oven is old (or unreliable) it may get too hot (i.e. above the point when THC starts to evaporate). Even then to be honest a few degrees over probably isn't going to do any noticeable harm. You'll probably be able to spot if its too hot from the increasing 'weed' smell.

Regarding the frothiness of the oil, you'll start to see that at around the 30 minute mark as the weed starts to oxidise in the oil, the amount you get will depend on a number of things.
That particular batch was slightly more frothy than I usually get mostly due to the weed not being dried and cured enough, however after about an hour or so the majority of that will have started to dissipate.

One critical point, make sure your using well dried and activated bud before you grind it up.
Put it in the oven for 5 to 10 minutes, again at gas mark 1. This will drive out any water molecules and help convert any remaining inactive compounds into active THC (depending on your weed, this can boost the THC yield by around 50 percent).

Regarding the amount of oil, think of the THC like salt crystals in water, not enough water means all the crystals won't dissolve (the water won't absorb any more due to reaching a saturation point), too much water however, and the mix is diluted (much less of a problem though).

Melt the oil first and then stir in the ground bud, wait for it to settle and then add a little more oil if necessary. You should aim for about half and half (although as long as you've got roughly a third more oil than residue you'll be fine.

Have you tested any of the weed yet for potency? It might be worth smoking a nug to get a feel for how strong it is, I wouldn't want you to go through the process for the results not to be everything you expect.

Anyhow, good luck and keep me posted :thumbsup: