Probably have to go to a standalone system. Don't know of any specific brand. From what I've read, piggyback systems can alter fuel curve, but haven't seen any stating they can adjust timing profiles.
Oh, BTW, I also heard the Z's timing curve is aggressive.
A Hui Hou
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2005 Lemans Sunset "Fairlady Z" Roadster, 18" wheels, LLumar Protect Film, Formula One 35% Ceramic Tint, Injen MR short Intake, Varis Intake Duct, Max Ground Kit (raffle win), DEI Hornet 700T Alarm System, Hardwired/mounted Passport 8500, Silver bulbs, smoked reflectors, Painted headlights with smoked strip. Gorilla Nuts lugnuts, JWT Oil Pan Spacer, Hawk HPS Pads, Stillen pillar vane XD and slotted rotors, PIPS