STILL AVAILABLE, CHEAP!
Now, Levy, here are my thoughts:
I doubt if you can change the ramp angle of the actual plates. I've never seen that done. Normally it's binding shims.
These were mounted on a pair of Nordica GS skis. They were then mounted with Marker 30.0's. That binding, and most "real" race bindings could be shimmed at both the toe, and the heel. Marker shims were quite thin. Maybe 1mm. If I recall, My son pretty much settled on toe shims that were 2mm or 3mm higher than the heels, and at max stand height. Maybe one shim at the heel and four at the toe? I can't remember exactly. I just recall having dozens and dozens of spare shims at one point for our kids. Both have been given away, as they moved on from Marker.
Later on he was a comp'd Head athlete, and they provided him with a TON of shims, and screws of various lengths to use with Head/Tyrolia bindings. Had pretty much the same set up. Now, keep in mind that he was working with techs and coaches who knew why they were doing, and also knew his boot setup real well….and watched him, filmed him and timed him train every day.
If you want to mess around with ramp angles, I'd suggest a binding that makes it easy. You'll need to track down the shims, which may be easier than actually getting the longer screws. The whole Tyrolia family, and Marker are those that I'm most familiar with.
This is a cheap solution for a plate to use in that experiment. It can be drilled for any binding, and can actually use helicoils if needed.
If you want a nice, new plate, check out the Head WC RDX that I have listed.
Don't know if that helps or is more confusing!