Scout,
I notice your algorythm sets definate days per box (3, 6, 14, 30, etc.). Although it's not a big problem, the RevTK gives last review time and next review time. If you use that to set review length, it mimics better what RevTK has set. Plus, if you look at the cards due by graph, it'll be a lot smoother instead of 8 spikes.
Anyway, I've had problems using the new plug-in, and I've procrastinated figuring out why. Basically, I created 2 cards (kanji to keyword, keyword to kanji) and wanted both to have the same due times. It did not recognize the attempt.