If you to get new rotors, make sure to check if they are directional and mount them accordingly. I believe the OEM ones and Z1 (blank/slotted/slotted+drilled) are not directional but don't quote me on that.

Any update on this? I have the same year Z with the same tires. Only differences being I have 20mm spacers all around and mine's not a touring just sport.

Additionally, my car has slight wheel vibration at around 70mph. I think my problem is a bad align/balance but I was curious to see what you came up with.