Holy moly, AstroMan!! Your UCD 46 weighs only 5 1/4 pounds with fiberglass reinforcing? Thats a very light weight UCD 46. It should be a super performer with the Saito 72 you're using. If it doesn't blast straight up out of a hover it may mean that your scale is wrong.

My UCD 46 weighs 6 1/2 pounds with a Saito 72 and I'm using 30% fuel to get good acceleration out of a hover. My UCD must be way heavier than everybody else's. If my scale is wrong it can't be reading more that 1/4 pound high.