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Chris, it's actually not a bad result. You've picked up star colour which is hard to achieve on this object. When you say " I tried the same thing again tonight ", I assume you're referring to varying exposure lengths and iso values with the subs you're stacking. It looks like you may have overdone the shorter exposure/lower iso subs, thereby preventing the capture of the smaller, fainter stars in the cluster. Maybe try restacking your subs with less of the shorter subs which will let the longer exposed subs display more of the fainter stars. Your polar alignment looks to be a tad out too but overall it's a pretty good shot. The colour change could be due to high cloud drifting past during your session which may not have been discernible to the naked eye but becomes obvious as you flick through your subs.
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