What active stylus are you using? I can’t seem to get one that is precise and easy to use (let alone one that has palm rejection).
As for the rest:
1. I use a Samsung fast charger for Galaxy S6 and the type-C cable that came with the tablet. Other cables (e.g., the one for the Galaxy S6) will charge 3 times slower);
2. Maybe one with Qualcom Fast Charging, something with an output of 2.4A or greater.
3. Chrome. Always Chrome.
4. SD cards seem to have some issues here. I’m using a 64GB from Sandisk and it seems ok.
5. The original film isn’t good to keep on and use as a permanent screen protector. I got a tempered glass one which seemed awful at first, with bubbles and areas that wouldn’t stick to the screen, but after a couple of days it all went away and it’s now fine.