Q Light Controller+

I have a crappy uDMX anyma clone bought off of aliexpress and I'm having big problems with refresh rate in QLC+ (rocks wildly from about 0.5-3Hz). When I write my own little python program and send DMX packets from that I get a blazing fast refresh rate (probably 100+ Hz). I think this is because my fixture has only 8 channels and my python program is only sending 8 channel packets. I've set up my fixture in QLC+ and it's only using 8 channels but I have a feeling that QLC+ is sending 512 channel packets in spite of that (the other 504 channels are then just zeros I guess).

Therefore I ask, is it possible to limit the number of channels sent out of QLC+?

How to change frequency: http://www.qlcplus.org/docs/parameterstuning.html#uDMX
For some plugin it is possible to set whether QLC+ should output full packets or strip trailing zeroes (artnet, usb dmx). I'm not sure about uDMX.

Thanks for the reply,

how do I configure plugins?