These are the springs I have in the front of my N1K:
Omni Fork Spring Kit
The spring is a 1.0 rate and Traxxion also made custom preload spacers (140mm) for my bike. Running 110mm of 7wt Maxina oil.
I'm running a Penske 8983 shock and Hyperco 6x575 spring on the back, so I can't help you with your Ohlins questions