i don't think going with the smallest size pole really has much advantage here. you still aren't going to take it backpacking. it's strictly a car camping device. packability and being able to easily lift it by yourself are the main features. making it a pound lighter really that big of a deal.
but, i would say that i probably gone with a smaller tube. i'll decide for sure once i've used it. i got it from texas towers (linked above) got the 2 1/8" with .058 wall diameter. it feels really stiff and solid. i think the finished poles themselves will be around 4# each or less, then those yard screws add a bit more weight, and i bought some cam buckles so the webbing will be adjustable. i bet it will be around 15# or less total weight.
i did find the emery cloth today. right next to the sandpaper at hd.