I tested and played around with SLIMT for a few weeks before I used it on meaningful images. I also used his bleach and redevelopment technique for extreme contractions (even harder to control). I would not recommend either of these techniques unless you know how to use them well with your film (and from all the testing I did with his bleach/redevelopment, it works beautifully with TMY, and so so with my main film at the time, HP5).
I think your best best is to just push the film.
I think your best best is to just push the film.