To my embarrassment I have to admit that I never got around to try that although I did find and bookmark KaniWani a while ago.
Anyway, I now ended up using renshuu to cover some of the parts WK did not inherently include [i,e, vocab/kanji production and grammar] and by now all is well again. I maybe was not clear enough that I had quite a struggle to get a good accuracy when I started with production on renshuu, but by now [i.e. 2 months in] this is no longer an issue as it was before 