Scout Bloodhunting Nerf - New Numbers?

If the base chance for a blood mage finding blood slaves is 20% per level of blood, does this mean a blood-5 mage, or a blood 3 mage with an SDR, which is supposed to be +2 blood for hunting, will always find blood slaves? How does population of province affect this?

I've not tested up to level 5, but this should be 100% indeed (maybe a small "fumble" chance even for high level mages ?). Do you use 270gp Warlocks to hunt slaves, anyway ?
My tests were based on provinces with 8,000 to 12,000 pop. Slave Hunt in larger provinces or in the capital seems too dangerous (possible unrest burst) and too expensive (gold loss).

In another previous test on a 5,000 pop province I've seen that my hunters were slightly less successful (about -20% slaves). But my test was limited on this point.
Unrest above 50 seems to make slave hunt harder, and much harder above 100.

Cheers