With 50% accuracy or even 70–80% percent accuracy, I wouldn’t worry about losing a few additional days/weeks, but rather how you can get more out of the lessons to remember the kanji from the start.
[I used the self-study script to directly repeat the new material a few times until I remembered it without thinking too much, in addition to the lessons.]
If you accumulate more content you struggle with it gets more and more difficult to remember new content. I would reset rather more than less
With the wkstats site you can objectively see where the problems start.
I’m not gonna be any further use 



