Just a heads up:
a partial (functional) patch for version 1.18 was let loose a few days ago. With this most all gameplay-related assets are translated, while flavor text (story, etc) will have to wait for the full translation. Needless to say this makes the game a good deal more enjoyable!
The easiest way to get this working would be to rename your old .dat folder and move the downloaded .dat into the Touhou Puppet Dance Performance folder. Don't delete the old one- you need it for future patching.
I'm more worried about over leveling my party...
I entered Chireiden recently and every time I get a new party member that I want, they're always 20ish levels below my weakest party member (who is 8 or so levels below the strongest). And then I grind, and suddenly, I'm over leveled.
Yeah, overleveling is a problem. Because of the built-in experience share system every time you get a new member up to speed you end up overleveled, and this compounds with each new addition.
Also it's worth mentioning that 80 cost puppets are fairly ridiculous: for the experience it takes to bring a 120 cost puppet to lvl 50 you could have an 80 cost puppet nearing 62, and many of them are very potent in spite of the overall lower BST (cough cough Power Kana). If you want to see the exp data for yourself
check out this link.
Once the full translation hits I'll probably start a new run myself and switch out all main members when raising new ones. I'll also probably avoid 80 cost puppets to keep the challenge right.