SeamusG is right on the mark.

I typically run 5% on all of my SuperTigres and they seem to love it.

Tweaking the "cat eye" as the documentation says only makes matters WORST. It should be adjusted as he said, if you've moved it.

The SuperTigres have a tendancy to have MINOR transition problems.

To get a good transition and no stall outs during nose ups, you must run the low speed rich, and that may lead to the engine refusing to shut off even with the throttle barrel closed, as there is a good bit of air leakage around the rubber boot seal.

Point the nose of the plane up after you've started the engine, hold the plane firmly and run it up to full speed.

Lean the HS needle for max RPM's, then back off 1-2 ticks, no more.

Level the plane and the RPM's should drop a bit. Drop the nose a bit and the engine should slow down further but not stop at full speed.

Level the plane and bring the engine to idle. See if it idles well.

Set the idle a bit rich so that when you throttle the engine up quickly there seems to be no hiccup or hesitation through the mid range.

That MAY mean that idle will be affected ( not all of my ST's require this but many do. ).

Once dialed in the ST are very reliable engines.