Well, that sucks.
Obviously, there’s no method that works for everyone, and WK/srs is no exception…
If you feel like giving it one last shot, you could try to install the self-study script, and do additional repetitions in between reviews. Of course, that will increase the work load in the short term, but hopefully decrease it in the long run.
By the way, I have found that the public API of WK makes it pretty customisable in practice, but you either have to know how to code yourself, or hope someone did it for you before. You can also have a look at the list of available extensions and see if something strikes your fancy.