[WIP] 22mm DD+single-7135 driver / single sided / Dual-PWM / Zener

I think noticeable based on Tom E and RMM’s comments in the A17DD-L thread. See RMM’s post #270 there where he gives a quick impactful example. I think that I’ve also seen another post saying that a triple XP-L does benefit from the SiR800DP.