Great write up, thanks. When you ordered the coilovers, did you spec your own spring rates? If not, it sounds like you have the 10kg fronts and 8kg rears.
I cant decide if I want 10 and 8kg or spec something like 9kg front and 9kg rear to keep the ride comfortable and to try and dial out some of the understeer that nissan dialed in.
I got mine from CS trader on here, I would assume they're the 10kg/8kg. My zed is a daily driver so I average 130-150 miles per week. It's comfortable on a steady cruise and no body roll when cornering harshly. I can also say I have found no understeer (after trying out a few roundabouts to test ). Please take note though, I am dropped 30mm with 20/25mm spacers and full camber setup front and rear.