Just saw this, sorry for the late reply. But thank you for the information!
I chose to set all Wanikani items to mastered on Bunpro so that I only get reviews for the same item on one platform maximum, that was still a bit weird though as I had to set some items to mastered in the grammar deck, but it hasn’t been an issue so far.
I haven’t really been waiting to start grammar, it might have been a mistake, but I’m starting grammar at level 7. I’m not doing too much of it and I’m making sure to pace myself if it ever gets boring or confusing but, for the grammar I already know I might as well have that circling in my reviews. I also wanted some more vocabulary, so I decided to use a vocab deck on Bunpro, and since the items I learned on Wanikani are master on Bunpro, (as stated earlier I did in settings) I’m only getting the reviews on one platform at a time, and I can learn more vocabulary on Bunpro without having to unlock the kanji in contrast to Wanikani.
I think this balance works alright for me, but I’m defiantly focusing on Wanikani a bit more at the moment. I’ll step up Bunpro and grammar maybe when I get a higher level, level 15 seems like a good place to start as you started there and I’ll see how it goes. But for now Bunpro isn’t my main priority. Though I’ll still do some grammar.