Blood sacrifice - optimisation?

[magnate]

Hi there,

Apologies - this has doubtless been covered before, but I really don't seem to get good results from the search function on this board; I can't seem to find what I'm looking for.

I'm playing my first game as Mictlan, and I know that blood sacrifice is instead of preaching, ie. to raise and propagate dominion. I build a temple, put a priest on Sacrifice, and make sure he has a blood slave each turn. Micromanagement hell, but easy enough.

Does the number of slaves sacrificed make any difference? Is it like one check per slave? Is there a max?

Does the priest's holy level make any difference?

Does the priest's blood level make any difference?

What about the current dom level in the province?

What about the pretender's dom level (chosen at start)?

TIA,

CC