TOPIC:

The warmer the engine gets the slower the fuel flows, even with a high flow fuel petcock. What's a reliable fix for this?

As Don Knotts once stated, "Maybe it will be louder with bigger speaker wires " !

Send some pictures of the fuel line, filter, routing and fuel-valve. And check the fuel-tank vent and the grommet under the filler cap!

Actually a larger wire will provide more power. Anyway lol. The fuel vent is clear. Fuel flows like the Colorado River until I'm in traffic and the engine temp rises to the "P" in temp on the temperature gauge.

There are also airways inside the locking fuel cap; you will have to dismantle it to be sure if they are all clear. This was one of the problems I had with mine when I first tried to set it up. The easy way to find out is to open the cap when the bike is running, to see if the fuel flows any better.

I've tried riding with the fuel cap open and the fuel flow still slows to a trickle when the engine gets warm. If I go over 60 mph foe ant length of time the bike shuts of due to full starvation. I wait a few minutes to let fuel fill the filter and go until the bike starves again.

Have you checked the gauze filter inside the fuel tank. I would also dismantle and clean the fuel tap itself.
These are the same issues I had with mine.