Not bad, but the pictures are very small Peter so theres not too much to say about them. As for your real NGC 253 (hehehe). What your most likely seeing is the effects of Flexure! mmmm I remember them days of hair pulling and wtf is going on see
here and
here for the before and after.!
Step 1 make sure everything is tightend down, more than likely you have a culprit some where and its hiding from you to twart your success.!
Step 2

ill keep honkin get OAG