Someone with experience will come along. As I have only fired a few slugs for familiarization, I may be all wrong, but I suspect the problem is too much choke. From what I have read that others say, everyone needs to pattern and experiment with what shoots best for them, but my recollection is that most do best with a modified or an ic.
Also, from what I have heard paying for a trigger job on an 870 is a waste of money.
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