I've made an alt character recently for the Cave Hermit credo specifically. I mined with the character for about a week after gaining level 1 of the credo (Significantly increased risk of mining out trolls.) but, not completing the credo levels entirely. Mining out 2-4 trolls per 30,000 mined tiles. Now with the credo completed I am barely mining out 1 troll per 100,000 mined tiles.
This significant change couldn't just be bad luck, could it?
EDIT: Mined tiles up to 450,000 since completing Cave Hermit without a troll. There has to be something wrong here...