AFAIR (but keep in mind that it has been a *long* time), the "low_speed" message gives you a boolean value (1 or 0), whether the "angle_rate values" should be interpreted as high-speed or low-speed. since i haven't found any documentation what "high-speed" vs "low-speed" actually means in hard numbers, this has been exposed to the patch.
I see why you said "high-speed" vs "low-speed".
If the speed is high(0), then divide by 4. If it is low(1), then divide by 20. (what you did in pd-patch)
I'm searching documentation of the high/low speed, but I don't know these divide factors(4 and 20) are good number yet.
Orientations from motionplus seems works, but I have to calibrate it too often. For example, at first time, the range was -180 to 180, but after some time, it change to -210 to 150, or below...
Here is a document about it, but I'm not good at electronics... http://wiibrew.org/wiki/Wiimote/Extension_Controllers/Wii_Motion_Plus#Data_F...
LG, Jonghyun Kim