UPDATE: I gave up and sold the car. Last Nissan I will ever buy...having owned and driven a plethora of modern fuel injected cars with drive by wire, it's simply unacceptable to have to deal with this in a modern fuel injected car. It wasn't even acceptable 30 years ago when I was messing with Holley carbs, and their propensity to blow power valves, but at least back then I could tune it and repair the PV when it blew.
I took the Nissan to the dealer several times and WAS ABLE TO REPLICATE THE PROBLEM WITH THE TECH IN THE CAR, and their response varied between abject cluelessness and "oh that's totally normal".
Sorry...it was a fun (and beautiful) car but not dealing with this issue every summer. Too many other cars out there that run properly. Thanks to all who offered inputs to try to solve this issue.