I'd think GC would be fine for the the VQ35. I personally like Rotella in something that has a flat tappet cam, and of course diesels.
As for engines that are hard on oil, like yours, and like this turbocharged engine, GC 0W-30 OR RTS 5W-40 would both do fine, imo. GC will go 8k miles, but you might not want to push it farther than that, while RTS will technically last 12-15k miles or more. It depends on what viscosity your 'want' for your engine, or by doing a UOA with both and seeing which it likes better.