I drill Level+1 on Anki, so that I can do all Radicals and Kanji (but not vocabularies) once the lessons appear. You might also be able to drill Level+1 on [Userscript] Self-Study Quiz
I did around 15 vocabs per sitting for lesson. For fast levels, I did around 25 vocab lessons per day.
I don’t really finish the review, but I keep the review below 100. However, I broke around Lv 46-60, where it was 3.5 days per level. I cleared the reviews after reaching Lv60, though.
At that time, I prioritized vocabulary only on Anki Core 10k breakdown, but not on WaniKani; always finishing level-appropriate vocabularies on Anki only.
My vocab Anki focuses on EN->JP and looking up in dictionary (http://dictionary.goo.ne.jp). My Kanji Anki is a derivative of [Version 1.05 | 2016-01-31] Anki deck for kanji writing practice
Apprentice count can be maintained by WaniKani SRS Reorder Button – once in control, it was around 150.
Guru count went skyrocket high. It was as high as 1200. I believe if it is under control, it should be around/below 500. (Currently 300). Don’t control Guru, though. Control Leeches – [Unsupported] Leech training script