I can complete cherry, lola, sanshi, and ice and have a few other scenes unlocked for the girls geeky to pantress. With all of that i get around a 8-9% increase. I assume tha is around where i should reset, because ow everything starts taking forever. This is like my 6 or 7th reset.
Im so happy i looked at the forums, before i would go days before resetting and get a poor 20% increase (not that bad just it took a really long time to get it).