at least some of these could be answered better by some of the others here and I hope they do. they are good questions.
1) AFAIK the answer is NO. the speed of evaporation----the lifetime of the BH---is governed by the mass of the BH
but different models (all are preliminary) allow for different relations between the ingoing mass of the BH and the outgoing.
2) I personally expect that if and when we observe small BH we will observe their high-flux final burst of radiation. So the answer here is yes.
3) YES! in my opinion, it will be the best or one of the best sources of information