change template for led strips

I have a led strip pwm controller that doesn't behave as it should - perhaps the price you pay when you buy cheap stuff from China. It doesn't react until dmx value 22 and has a visible step between 254 and 255 that doesn’t look very good.

Is there anything to be done in the template to help with this? Im thinking I should be able to change the 0% value on the channel to dmx value 22 and 100% to 254. I would also like to play around with a different dimmer curve but I haven’t found where to do that either. 

Would appreciate some help.
 
Rolf
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