My new suggestion is to avoid teflon tape and go to RTV. I have seen bits of teflon tape floating in one of my new systems and it didn't make me happy. With a bit of clear RTV on the threads, screwed a very snug hand-tight, it doesn't leak and it doesn't put bits of tape into the coolant.
As to the cooling effectiveness of the vertical solution, it seems that it shouldn't be as effective per unit noise as a solution which is thin (air moves through wide area but thin distance). After all, a longer travel through the resistance should be more restrictive and it should be picking up less heat as it stays in contact with the radiator. That's my off the navel theory.
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