It is certainly the season for M13 - I'm processing mine now. I think your exposures are pretty good. You have got really nice star color.
Can you go back add more? It will give a lot more extent to the cluster - I took 150 5-minute LRGB exposures and the cluster grows considerably, but with the RC10 - the big ones then are starting to become cotton wool blobs.
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M13 / NGC 6905 w/C8 EdgeHD, ASI1600MCC
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