I've done several of these micro turbine conversions, 2-Habu32 (one with Kolibri T35, the other with a K30, Habu32x with K30, FW T-45 with K30, and FW T33 with X45 (used Paul's kit). I'm currently working on another FW T-45 with an X45. I've used the JP brakes in all of them. If you want them to work proportionally you have to remove the magnets in the wheel hub. Once the magnets are removed the brakes will work nice a smooth and be fully proportional with the controller that comes with the brakes (no need for an aftermarket controller). For those of you interested, I made a video on how to remove the magnets. The process is slightly different depending on the wheel size but this video will give you an idea:
-Tom