I'd be fairly confident if the 370 was rolling on Yokohama Advan Sport V103 (as the brochure indicates in NZ), that it would be much quieter. Having had both RE040 and I have V103's on now, the V103 is a quiet tyre in comparison to the RE040 (not much different between RE040 & RE050 in my opinion). V103 still has the very rigid sidewalls (like the RE050), so has fantastic lateral stability.
I think for me the big hefty strut where it is in the 350, with a vertical torneau if needed, but with bigger bags, it's completely locked in there, it can't slide forward if for some reason you have to do a hard stop. Safety. Horizontal torneau's aren't big enough to accommodate say an overnight bag, + gear.
We've had bad traffic here for donkey's years. Now the population is at over 4mill, with 1.7 in Auckland, rush hour, is called rush hours, both ends of the day. Just like any big city, that has a basic & underutilised public transport system. Even so it's a stunning, laid back place to live. We have more cars percapita than anywhere in the world.
All in all, I think the 370 is a great drive, extremely similar to the 350, but with more juice & some tweeks. Easy to drive, involving, better chassis and suspension out of the box. And if what the Nissan guys were telling me today, with a Stillen supercharger and a few goodies can push 500 horseys, not bad.