filler neck modification

I've read this thread quite a few times and I'm still wondering if there is any definite answer for solving this issue. I took some pics of my stock factory neck. The first pic below you can see that the original vent is longer than the filler neck and it is not centered in the filler tube. The larger half is the bottom of the tube leaving a smaller half for venting.
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In this pic you can see how the factory cut small slots in the vent to allow the venting to exit. Of course this is the top side of the filler.
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In this pic you can see how the vent is added to the side of the neck using 1/4" tube. Also when the filler is in place the vent is not straight up but more to the side. Then the pipe heads towards the front of the car about 2 feet before it turns around and heads back to the neck then turns about 90* following the neck down to the tank before it exits the trunk thru the rubber gasket which allows it to vent outside the trunk.
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SO, some have gone with the washer or restrictor in the neck and seem to be satisfied but others have said it didn't cure their problem. Others have thought a larger vent inside the neck. Then there are those that believe it is the fault of the gas nozzles. I remember when I was 16 years old working at my dads garage in the early 70's and often getting gas baths as I filled customers cars with fuel. I've done the gas nozzle at every angle from side ways to up side down. Seemed to be worse in the heat of the summer.
I can cut the neck open and do any or all the mods mentioned. I was also thinking about increasing the size of the exterior vent tube to 1/2" by drilling out the original 1/4" and using this fitting.
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If I do a larger vent should I put it straight up on the top of the filling tube instead of towards the side? Also should I add some additional slots in the original vent inside the filler or just remove it and add something different?
The tank itself is not vented in any way and I have gone with an electric pump and a return line back to the tank. Does that add a need for any other venting?
I'm like many others in this thread that have said their cars are not ready yet but they plan on having fresh paint when it hits the road. Like them, I don't want that fresh paint being washed off from fuel spills!
Thanks in advance for your help
Rod