https://www.helmet.beam.vt.edu/bicycle-helmet-ratings.html
Click Road
Anything that's 5* or 4* is going to be safe. I typically go with MIPS, which most of those will have. Like with your track helmets, go try some on. Freewheeler should have Bontrager (I've got one of the 150ish$ wavecell helmets and it's solid.) Davis Cyclery probably has a few options. Biggest thing other than fit is going to be ventilation. It's brutally hot where you are so lots of vents/airflow would be my rec. Ken's will have Specialized, Bell, Giro, and Abus. Looks like the only Smith they have is one you'd want to skip.
Also, you don't have to spend 300$ to get a great helmet, though you'll find plenty in that range.
One more thing, some places offer different fits. See if you can find #68/69 at Freewheeler. Asia fit + Round fit. One of them may fit you better.
If you find yourself looking at the MTB ones, Fox usually does a lot right, but I'd probably not look much further down that path than the Fox Crossframe or Speedframe models.
You can ask Colin about POC and a couple others. POC was something I wanted to try, but sadly they don't make a 7XL