Finally the decision has been made.

I don't think it would hurt. But.......and this is simply MY personal opinion here, so take it for what it's worth, but I don't like Teflon seals on the street. I prefer the Viton rubber. I've just had better luck with them. That's just my personal opinion, like I said. Teflon seals are geared more towards race oriented engines. I would even rather run a standard old umbrella rubber seal on the street instead of Teflon. Course, opinions vary. I do agree though, you should probably cut the guides down a little.
I agree with you and the umbrella seals for I think it would just be simple. I'm pretty sure I can cut the guides down that much by hand (dremal and a file) just use the umbrella seals ( I have new ones already so that saves money lol)