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It's definitely guiding...problems with temp will introduce noise into your piccies but not wonky stars like those ones. Unless, of course, you have a marked temp gradient between outside and inside the tube, in which case you'll get tube currents which will screw with your viewing and imaging. Make sure you let the tube cool down to ambient (or close to) before you start imaging. I'd say, though, from your description that it's the mount....you do need that EQ6, especially after hanging off the scope a CCD camera, guidescope and all the attending bits and pieces. Your scope has to be as close to rock steady as it can be. For that you need a mount that's going to give that sort of performance, a good heavy, robust one. Then you can worry about getting really good polar alignment...which you will need to produce pinpoint star images over long exposure/guiding times.
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