Finally levelled up 
after 10.5 days on level 11 items, with 10 vocab carried over, including a surprise level 9 laggard thanks to the Big Reshuffle.
The nifty chart from @Cookie316 ‘s progress tracker shows how switching to Today’s Lesson drastically slowed down my ability to keep an even pace.
Replacing a few vocabs with kanjis using the lesson picker should do the trick… might be worth leaving the kanjis with fewest vocabs for the end, to minimise the number of leftover items upon levelling up 
?