Thats a great result! Still quite sharp to me, the dust lane edges really look good.
Poor guiding may have been because you were looking through so much atmosphere so close to the horizon, the seeing in the guide scope was probably not great and the star appeared to be moving even if it wasn't. But the proof is in the image, and this looks nice
What proportion of subs do you reckon you got rid of?
Any thoughts on using higher SNR stars when seeing is bad/target is low? Sort of makes sense to me.