Have you read my guide for WK? Specially the chapter 4, where I mention making a schedule for Wanikani. This might help you understand how Wanikani works and lead you to realize that doing reviews every single hour is actually the biggest waste you could be doing with your time (not to mention mental energy).
Another way would be for you to actually reduce number of lessons/day. However, I suspect the problem would still be there as you can’t resist not doing small piles of reviews. The problem isn’t necessarily about the total daily pile itself.