S-pen replacement and calibration

This is a two part question.

Firstly does anyone know if there is a way to calibrate the s-pen. Mine seems ever so slightly off when writing as I would with a normal pen (on a slight angle).
I also have the bamboo feel but that is even worse (around 2-3 mm off).

Next question is are there any other s-pen out that like the bamboo feel? I like the bigger size of it as it's more comfortable for writing with but accuracy seems to be the issue with some third part pens. I'm surprised there issue nothing from Samsung already for the note 5. I understand there are the pen holder or the bt pen but those are for older devices so I'm not sure how accurate they are or compatible.

Sent from my SM-N920I using Tapatalk

Spen wacom digitizer android source?

Anybody know where the wacom digitizer drivers are for our tablet within the Android source code and what changed between 4.4 and 5.0?

Use a spen with eraser and it worked completely in cm11 but when switched to cm12/12.1 the eraser no longer works nor does the tablet recognize movement on the screen with the eraser.

IT DOES WORK IF I ROLL BACK TO CM11 OR TW ROM with full functionality.

Also how would I pull up the wacom calls in logcats or ksmeg or the sort?? I'd like to help fix this but don't know where to look!