That pic is of the rear wheel off my Porsche race car, 18x13 with very low profile, and it was insanely fast. Set some records at Sears Point and Thunderhill back in the day under the PO's owner and drivership.
I do know what you mean though, low pro isn't always the best handling. Look at F1 cars!
My car is mainly for looks and maybe track days, so I'm going for the right look, and then going to get what I get on track.
I'm still going to run the same "cheater slicks" that I'm already running in 335x35x17.
I just want to go 345x30x18 or 19 in the rear, with no outer tire diameter change.
I saw some vids of HRE wheels, 10G's for a wheelset is a bit steep for me.
I'm hoping there's something out there that's reasonable.