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I think you could just be pushing the magnification too high, in bad seeing and on objects at low altitude.
The jetstream has overhead for ages now, and the bad seeing will mean that trying to go any higher than your 7mm on its own, is likely to produce very displeasing images that are blurry and difficult to focus.
The 2x may produce a slightly better image simply because it's less magnification.
I think you'd need to try it ONLY on your 14mm, which will you give the equivalent of a 5.6mm eyepiece, but again, ONLY when the seeing is good. It will be extremely rare that you'll ever use your 2.5x on the 10mm, and pretty much never on your 7mm.
It would be better to try the 2.5x on something around the 20/25mm focal length (equivalent of an 8/10mm EP), and hopefully you'd see a much better image .
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