Interesting results. Thanks for sharing them.
I'd expect you'd end up in a similar relation with the spirits regardless of whether you set all traps/do all kills at once and appease the spirits one bit every day as if you'd spread the offensive behavior over a longer time while appeasing the spirits. Note that if you do it all at once you may hit the bottom, at which time your relation can't get worse, and that the relations slowly and gradually return to neutral if nothing is done affecting the relations (such as e.g. living from vegetable/stored food, not killing anything [etc.] nor sacrificing).
Of course, doing all the offensive stuff at once leaves the spirits rather displeased with you for a while, so spreading it out is probably better.