Finally started level 27 today! Got a bit overwhelmed during level 26. Twice I hit over 800 reviews then ended up doing nothing for a few days and getting back to the same point. Each time though as I had missed reviews my accuracy went down.
Finished the vocab though and waited till I had no days with over 250 reviews in my week forecast before starting any new items from level 27. I quite like doing new items quickly during a level as I feel like I’m gaining momentum, having the kanij fresh in my mind makes the vocab easier and it’s quite motivating. But sticking to no more than 20 new items a day, and waiting to start items from a new level till reviews are under 250 for the next week feels like a good compromise.