How dark should I tint my Z?

Streetlife

I ordered my 2012 370Z, as you can see in my avatar that sticker in the windshield is to be removed by the owner only, the PDI hadn't even been done, it was done when all of my mods were complete, told them not to touch her didn't want dealer installed swirls. After taking delivery of her, I did notice a few cars on the lot with tint. After seeing mine once i brought her back to have baker tuning install my mods , the service department manager asked me who did my tint because their installer wasn't nearly that good, and that he was looking for someone who was good at doing a clearbra (clearbra was for his own personal car though).

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Tanabe Medalion Exhaust + Tanabe Y-Pipe, Baker Tuning, K&N Drop-Ins, Z1 Post MAF Tubes, GT-R Button, Nismo Magnetic Oil Drain Plug, CeramiKool Tint 35%, Solar Gard Clearshield Clearbra