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I think that galaxy actually does have an oval glow doesn't it?
RE: The processing. Yes it can be difficult knowing when to stop, how much is too much or too little. Basically, the more (good) data you have, the more you can stretch or process the image. Even with a lot of good data, one has to be careful not to over process certain aspects of the image.
Depends on object type too. Comet photography is a little different from regular deep sky. Most comets pics are deliberately over processed to bring out the faint tail structure. Mega data is never available for comets due to tail motion. At most an hour or two.
Another consideration is image size and if you want to print it out. A small image for forums like this one, the data can be squeezed harder and no one will notice the difference. But if you want to "pixel peep" it at high resolution, put up a full res image or do really big prints, the job is much more demanding on taking and processing the image.
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