Also running 2 tanks for 3 weeks, of which both are of the cutie type, and one is non-adult is probably not the best of ideas.

Besides being way below the pace the game needs it also leaves all the eggs in one basket so to speak.
Meaning it ticks of one niche but leaves anything from sexy, busty, milf and so on barren.

While a vulgar concept, it is an adult game and the pay model is built around it, so the basic sound move is : to run a cutie and a busty and then supplement with a mega-cutie or mega-busty or prestige model as the ultimate, to cover all bases and really drive players.