If you haven't already got it, the other bit of software that you may consider is IRIS - but only look at it if you are willing to invest a lot of time in working out how to use it, since it is very user unfriendly (for example some functions are in drop down menus, but most are command line??). IRIS has an incredible range of powerful tools, including a background removal process that could clean up the uneven background in your wide field image.
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