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First thoughts:
You haven't got a gas ram fitted? - They lose power like no one's business and (apart from the original Theoben and HW90) being sealed, you can't increase them back up.
Check the breech seal - If everything else is okay (no graunching or difficulty cocking), sometimes a simple breech seal replacement is all that's needed.
I'm not too familiar with the SuperSport but - it might need a new seal on the piston (are these O rings?)
Have you changed pellets? - believe it or not the variations you mention can be down to a change in pellet type.
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