So, I bought something from the cash shop and figured I'd spend the rest of my CSC too since it was really uneven from the weird pricing. I'm now at 2 CSC (this is after buying a 100 Credit Gift Card to try and fix it). How do I even it out?

You can buy the Plus One Sticker. It's only 1 CSC.

facepalm I forgot about that. Thank you xD