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Firstly - given the relatively short integration time, that's a pretty good effort. Stars are usually tighter in NB subs because the spectra of a star is a continuum, so relative to the nebulosity they won't saturate as fast in Ha. What is not clear from your post is how you are focusing- this usually needs to be done for each filter, and can be very trying to perform manually. This, apart from guiding performance, is what makes stars fatter than they need to be.
I like pixinsight, there are heaps of other packages of varying merit, and I would say look at them all and play with a trial version before deciding. Ps is still the dominant tool of the current masters of this art.
Cheers,
Andrew.
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