Yes, its genuinely tough to figure out if you have a winner on your hands most of the time isn't it. The flip side of the coin is possibly even more frustrating though - you think the focus is a bit off and its late so you don't give it your best and later regret when you're processing and discover the data is actually pretty good.
I think you're being a bit hard on yourself with this one. Take another look after you've caught up on sleep....
I suspect a bit of Ha blended in from another night on would firm up the tightness of the stars and neb for example?