A few things to try:
1) 1/16-1/8 total toe-in in the rear.
2) Disconnect one side of the rear sway bar at your next autox event.
3) For at least one run go full soft on the rear shocks and full stiff (or close to it) on the front shocks.
While none of these will do much for the nose dive issue, both of these should "tighten" the car up and help stabalize the rear end.
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'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
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