First Off: One gallon through the big Moki's is not enough. Mine started running real well after 5 gallons. I have had the 180 on three different planes over several years and it still starts easy and runs well.
I, too, had the Moki on a giant su-do-khoi and it was a good combination. Lots of power to weight.
You must use the large diameter tubing from the clunk through the carb. You may have to drill out the clunk as well. The su-do-khoi used to come with a relative small profile tank (8 oz I think) and these small tanks have small clunks.
I have tried the moki both with the cline regulator and without it. When using the cline, you must still use the large diameter tubing on the 1/2 inch section of tubing between the regulator and the carb. You can use any tubing you want everywhere else.
Jim Gerrard modified my carb when I first installed the Cline system. He said the early (pre-1999) engines were NOT designed for the cline system (under the cline system, the carb sees zero pressure in the fuel system).
Later carbs were designed to use either muffler pressure or the zero-pressure cline system.
Here are the pro's and con's of the cline system: With the cline system the needle valve setting is constant throughout the entire flight in any flight attitude. Very useful in hovering, etc.
The con of this system is that every once in a while it gets some dirt in it and it "sticks" open and floods the engine out. You must keep the fuel very clean and use a filter before the regulator.