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Probably a combination of both things, one step colder made a huge difference on my old fiST and I did the symposer delete asap, then into a turbosmart bov. So I never ecountered anything as the symposer almost never existed. You shoulda posted up on here looking for a symposer I have the mountune one from when I switched to the turbosmart/mrx turbo.
I still miss my fiST even after getting the RS.