Clean the dashpot innards and piston with brasso, and I think you will solve the problem.
I would clean an su dashpot twice a year with a spot of brasso on a rag, let it dry to a haze and polish.
Setting mixture with a Gunston colourtune plug at tickover, two are easier but at the time I could only afford one.
Ballencing the carbs, I used a Gunston carb ballencer. Not having a musical ear I found the floating indicator in the airstream a far better method.
I did find that once multiple drivers used the car the SU s would go off song quickly, if only the one driver they did not need balencing for months.
I also used this method to balence twin Webber DCOE carbs with took some time with only the one colour tune plug as it needed moving between the 4 barrels and the carb ballencer had to be used on each barrel also not just the 2 carbs.
Paul.
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