Systems Slopers

I have the Atomik 50/130 degree slopers on my systems hangboard. I find them too easy. Aside from investing in a Beatmaker hangboard with the 45 degree slopers, does anyone know of some extremely difficult systems slopers?

I’ve resorted to using my ProblemSolver and Grippul boards for this, which both allow you to mount your own holds. Choose any horrendous sloper (or otherwise) and a couple bolts, and suffer away.
Personally, I’ve only been able to hang (barely a second) on the Beastmaker 45* in a front lever position, and that’s the only way I’ve seen it used effectively at all 

If you're a little bit handy with wood and a saw, it should be easy enough to create a wedge to mount the holds on, thus making them "steeper".   Bolt the wedge to the board and, with a slightly off-center T-nut, bolt the hold to the wedge.