You may try adding more fingerprints to slow down the matching as it searches more. Slows down some phones. Not sure about the OP3. I have 4 setup and mine is still quick. Try to Max out the number of fingers.
QC works by using higher voltages - QC 3.0 goes up to 20V but uses lower amperage.
Dash keeps the voltage at 5V but uses 4 amps to get charging speeds up.
Unfortunately they are different technologies because I would love more charger options.
The only way I could completely remove SuperSU was to dirty flash OOS. Otherwise safety net still detected SuperSU. Rooted with magisk and used magisk hide. Can now play Mario run and used Android pay.
The wifi antenna or chip in the OP3 is awful. I can get maybe 30Mbps on it with a fiber connection. My old Note 4 has hit a Max of 560Mbps sitting right next to the OP3. Both on 5GHz. Note 4 is MIMO, OP3 is a single channel and not very good.
Just run a bare screen. Screen protectors ruin the experience. I'd rather have a few light scratches after a year than dislike the feel of the screen every day I use it.