Re coolers. About 8 years ago I started making my own coolers. I use the same tubing size as the lines and wrap it in a coil around a paint can etc (just to form it then remove it)for about 12 loops and then return to the trans. it works so well I wonder why I ever bought a cooler. Gets rid of the excess heat nicely, doesnt plug , easy to clean and strong enuf not to leak. And I drive to the line and back to the pits with no issues. I put the inverted flare nuts right on the tubing ends so it is a one piece stand alone unit. Even on a long stage at 4700 on an 8 inch converter no issues. Someone once suggested it was a dumb idea (because of course it wasn't store bought and wouldn't work) so I suggested he hold his hand on it. ;>)Apparently he had no faith in his own words. Which brings me to another issue. Why do people say thing like that when they can plainly see it is working and has been for some time?
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Re Dads
I have one of those too. My Dad is an engineer (EE) and reminds me I am only a technician. He decides he doesn't have time to eat and being an engineer he believes allows that since "he knows" . I totally respect his technical ability in his field as he has had quite a career but in real life , well you obviously understand. He is now 90 and will never change so we can only try and help and keep our mouths shut hoping of course we will not wind up the same but knowing probably we will.