vapor lock heat problems

[milehigh69]

I have a efi system on a 454 with procharger, rock valley tank with 300 lph Deatsch in tank pump.
the car runs at 180-195 degrees normally. I have a aeromotive regulator mounted over the rear axle and is set at 45 psi which is what retrotek wants. I have an inline gas radiator from Barry Grant. The problem I have is after cruising around the fuel gets hot, even without sending it up to the engine bay. I think I know what is happening and wanted to ask you guys to see if you agree and have any ideas on how to fix it. The pump is pwm modulated so it is noy on full bore unless the demand is there. However pumps heat up gas. if the car is mainly cruising, it is returning warmed up gas to the tank most of the time. Eventually the fuel is pretty warm if maybe hot. eventually I get vapor lock. let me know what you think.