Ad 1.
Each turn you tax 200% means about +20 unrest. Here is the table http://dom3.servegame.com/wiki/User:...fect_unrest.3F
Killing brigands by patrolers is random, but 20 patrolers (with patrol strength 1, but bakemonos are slightly worse patrollers) is minimum, they sometimes catch 1 sometimes 20 brigands. Each killing brigands is -1 unrest, I guess. 40 bakemonos is safe number for 200% tax.
Judging by the table there, to have a 75% chance of neutering 20 rebels, I'd need 80 bakemonos or more. Does anyone know how to calculate how much worse Bakos are?
So, I don't know if anyone cares at this point, but after experimentation I can confirm that with monster scales and 200% taxation it's easy to get several castles going by turn 10.