Sounds like you need a by-pass style regulator and a return to the tank.
If you don't want to go that route, then try moving the regulator as close to the carb as possible. That way if it has a check valve on the outlet side there will be less fuel to heat soak and expand.
I could be wrong but I'd assume the pump allows some kind of slow pressure bleed off, they have to have a check valve to operate properly ... but often have a bleed of some sort to prevent just such issues.
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