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Hmmm, that is interesting. By way of example I have attached two sections of one of my images. Taken with D3 and 14-24 f2.8. There is some field curvature (PA related) but the seagulling is really evident. When I stopped this down I found I got much better results. MInd you this is 5 minutes on a guided mount. Some of my more recent images I have just the lines such as you do Alex.
I am assuming shorter subs even on a guided mount will show less of this particular problem. It is quite odd that your images wide open show no seagulling. I may have to investigate this a little more. Perhaps my lens needs some adjustment work done to it.
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