Yep, exactly my thoughts re the twang caused by increased surge. Shame yours doesn't like the FTT, pointing one even more towards the 7.9s. The other pellet that mine positively loved (and preferred over the Exacts) was the boxed Crosman Premier 7.9. Still available from our sponsor, I think? But they're a harder pellet than the Exact, so I think I'd be trying the 7.9 JSB first.