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Hi Mike, If your pole length is shorter than 80" then 1" will do according to Kreige. I've used a 100" FL 18" F5.5 'scope with 1" tubes and couldn't fault it. I had a look at Kreige and he doesn't really discuss the wall thickness in relation to his formula.
Thickness is not so important as diameter, but if you were going to 1.6mm wall tube in 1" , you might as well use 32mm X 1.2 which would probably weigh similar. From memory the problem with long thin poles is resonant vibration in a breeze, though I've never seen it myself. He generally refers to cases of a classic 20" F5 scope. I certainly wouldn't use 1" poles on a 20" F5.
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