Been playing for almost a week now and I've been wondering if I've been using these exp cards correctly. Is it suppose to take like an entire stack of large or super exp cards to level just once or twice at Lv50+? It's a rather extravagant amount and extremely tedious.

What do players generally do when they have no more room for girls and buildings to increase capacity are still on cooldown? There is a fair amount of girls available and not enough space for them. Right now I've been keeping a single copy of every SR and above I've picked up but it's starting to feel like a waste of space. Should I just sacrifice every SR I don't think I'll ever use?