The thing i noticed now is that this mod indeed works, getting upto 2200mA. But the thing is z2 heats up pretty quick and as battery temps reach near 45°C QC is switched off and it is throttled down to around 970mA. Hence u cant see the difference between normal 2.0amp fast charge and QC. If somehow we manage to keep the phone cool and away from throttling the charge we can see benefits.
OP I got a request to pls increase the QC throttle threshold a bit higher (48-50°C) and maybe check the benefits.
So i can see difference if temp lower than 45?