Martin:
Perhaps your dilemma is airflow over the oil cooler itself. If you can find a way to maximize airflow, the 34 row would make it's money for you. I haven't taken mine on any circuit yet, but I ran the Dragon and the two connecting highways in 2 loops while they were doing the car show during ZDayZ 2013. Lets just say, I drove gingerly and my temps never exceeded 230.
As far as clutch goes, I have the ZSpeed CSC and SS braided lines. I have Competition Clutch's Twin Disk and it is the money. You may have to call them about it because I haven't seen it on their site, but John from Zerolift told me that it was a beast to install. OS Giken is a sure shot as well, but you are going to pay for it. I have no experience with OS Giken in a Z, but I had their twin disk in 2 out of 3 S13s I owned.
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 2007 350Z NISMO #0618: Zerolift | UPREV | F.I. | Greddy | Competition Clutch | Injector Dynamics | Aeromotive | Pioneer | JL
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