I'm going to try and make me some 6-8" mega tubes and wondering what would the best size hook be?

Does someone actually make a 7/0 widegape or maybe even bigger?

owner makes 7/0 and 11/0 EWG worm hooks. I use them for night fishing. the 11/0 would be PERFECT!

You can use a 5/0 by pushing the hook up through the hollow middle like you would with an inserted jighead. Then squish the tube up to where you want the point of the hook to come out. This way you can Texpose for a weedless presentation. When the fish bites, the tube flattens and the hook becomes fully exposed. Hook-ups are fine, you don't need a fully exposed point.