My 370Z back when I drove it on Laguna Seca was similar setup to yours. Most of interior in car plus a roll bar so it was close to stock weight. Stock under 300 WHPP motor, coilovers, stock wheel widths but with Hoosier DOT R. Was couple seconds faster from your fast lap and thats with huge fuel starve out of T4 ..car was coasting 1/4 of the straight and little out of turn 10. Pumps stopped working that day so I was running 1/2 tank my afternoon sessions. It was banging out 1:44 to 1:45's without thinking. Without fuel starve it would have been in high 1:42 to low 1:43 range. So suspect you have some setup opportunity.
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Grant
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