With your data try and run with the colour at bin 2x2. This will allow you to capture more colour for the same amount of time while not loosing out on resolution as your Lum channel captures that.
Also the other reason i asked what time you where running is 350 seconds is a odd time 300 seconds is 5 minutes Though its all good at the end of the day.
Also what are you using for collimation of the 8" newt? as you seem to be pretty spot on.
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