It looks like the 255/30/19 front tires are causing the problems. Too low profile. Stock (non-Nismo) fronts are 245/40/19, so a slightly wider tire (255 or 265 are common) with a 35 profile is ideal for keeping close to the stock diameter.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |