I'm sure that a UAT has too much flow restriction to work on a non-pumped application.

Why are your tanks vibrating so much? Sounds like you need to balance your prop., or maybe there is a problem with your engine. Try mounting both your main tank and hopper in foam rubber.

Are you sure that you don't have an air leak somewhere in the system? Usually the easiest thing to do is just replace all of the fuel lines and tubing.

What diameter fuel line are you using? You should be using at least large (1/8"), or better yet extra large (5/32"). If you are not using 5/32" try up-sizing the flexible tubing AND the brass tubing in your tanks. Also drill out your clunks to 5/32".

Good luck,
Joe