Welcome back! The fact that you kept your reviews up is fantastic, since you’re really drilling those words/kanji into your head without overloading with new material.
I know exactly what you mean, because I’m a “racer”; gotta complete every level as fast as possible. That’s pretty doable through about the first 15 levels, but as you get higher you are getting more and more “enlightened” and “burned” reviews popping in. PLUS, new material is harder for two reasons: (1) more complicated kanji to begin with, and (2) similar-looking kanji become more frequent. That means more mistakes, so more reviews. It can snowball if you’re at max pace.
So basically, don’t worry about losing a little time, as soon you will probably need to slow down a bit anyway. You’ll probably enjoy it more if you’re not getting 200+ reviews every day. You’ll also remember things better too.