Hi Rob,
As Raymo has stated, making sure that the alignment and tracking mode are right is the first critical step. Given that you can't equatorially align your mount, you're always going to be dealing with star rotation but looking at your image and the movement in the stars, it doesn't actually look like this is your issue. You need to make sure that the mount is super stable, even ad weight to the tripod if need be. I used gym weights on the accessory tray. Make sure you're nowhere near the mount/camera when you're taking the image, remote intervalometer or simple remote trigger.
If you can post a single sub that's maybe 10 second long so we can see the length and direction of the trails, we may be able to help you further ?
Cheers
Ryan
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