As I've said a couple of times now:
You can not run the hardware PWM at a frequency below 1221Hz - it's not a bug in PBP and not a hardware issue with the PIC or the circuit, it's just the way it is.

The reason is because TMR2, which is used for the PWM timebase is 8 bits wide and has a prescaler with a maximum ratio of 1:16. At 20MHz the timer ticks at 5MHz, so 5,000,000/256/16=1220.7Hz. If you try anything lower than that it will not work properly and I'm pretty sure that's what you're seeing when trying to run it at 200Hz.

To prove or disprove, try it again at 1500Hz and see if the waveform looks better. I understand that it won't work in your particular application due to the LED drivers but it'll show that actual problem is that you're trying to run the PWM at a frequency (200Hz) which the module is incapable of producing.

/Henrik.