Sacrificial Pit – how to use it correctly?

The Pit provides an additional bonus depending on the total health of all creatures sacrificed in the city since the beginning of the game. For Furies, it's 300, 600, 1200, 2400, etc.; for Minotaurs, it's 1200, 3600, 10800, etc. The Hydra's health is 175. I sacrifice Hydras. Two give 1 Fury. Four give two. Seven give three Furies and one Minotaur. I sacrifice 4 Hydras on medium-sized maps and seven on large maps. I try to get a hero with the "Recruitment" skill. As a result, I have +3 Aces, +5 Furies, and +1 Minotaur. And on very large maps, this is a very significant bonus. And if I'm lucky with the city's specialty, it's game over for everyone.