As you've already tried FTT, as per some above posts, give the JSB derivatives a try (quite a few to go at) and also the RWS Hobby.
Bear in mind that if the rifle's running at 11.2 with 'Domes, it could quite easily be over with other pellets, so power test with as many as you can. The 12ft.lbs limit is an absolute figure, obtainable with ANY pellet and not just the ones you use.
Maybe get some sample packs to save on costs?
P.S. By the way, not knocking the good old Superdome, as many of my rifles like them in both .177 and .22 and I'd regard them as a reliable performer (if not the absolute best) in many guns.
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