To the horror of many at this site, I am not using any filters at all:
I can't understand why you would have problem with fuel boiling. I have owned many Webers and worked on many cars (including original Cobra's) with Webers and have never seen that problem.
Maybe you should consider an electric water pump that you can leave on with the electric fans for 10 minutes after shutting off your engine?
Alan Sorkey
CSX4083
Shreveport, LA