Try OB7 stock 1st. Your on like NK2 or NIE. To be honest not sure what would be your best path from kitkat.
That's been confirmed already. From what I've read in reports, no going back from OG5 bootloader.
Weirder still, my S-pen is perfect. Clicks right where the tip of the pen is. But my finger goes from dead-on accurate in the top left to 1-2 inches off in total at the bottom of the screen. Any dev happen to know where this calibration might be? Hoping to delete it and force it to recreate.