What is the NR part?
EDIT: Never mind, brain resumed function as I clicked 'Save'
I think the track is best run with stiffer springs and slightly higher ride height than what other tracks would be run in.
If by lower suspension height you mean using a higher value in the tuning menu, then yes. Although the tire compound does not matter because the suspension will act the same through bumps.
No it won't... in real life, tyres with more grip have harder suspension, allowing lower ride heights.
More grip = more load on the suspension = harder suspension.
Let me see if I understand. So, if all other things being equal, if one changes from RS to SH tires, one should soften suspension?