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Not a bad narrowband there. Those blue star halos are they from the O111 layer? You probably need a star mask on your O111 layer so the stars are excluded to prevent the ringing. Narrowband can be prone to odd effects like that. Your O111 may've been a bit out of focus and the stars were larger than in the Ha. With my Astrodons I focus using the luminance and luckily the Ha O111 and S11 seem to be parfocal as focusing narrowbands by themselves is a bit slow and tough to do.
I saw your image last night when I was looking for something to image and I decided to image it so thanks for the inspiration. That vertical wall is an interesting feature.
Greg.
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