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Hi Brian,
I'm not sure dropping your shutter speed from 6 secs to 5 secs will show much improvement with your elongated stars.
As an exercise why not try about a dozen shots at 1 sec, then pop your lens cap on and take say four Darks, then stack them all in something like DSS (it's free), assuming of course your camera allows you to turn off in-camera noise reduction, otherwise you will be doubling up on the Darks as your camera will take them automatically (and load up it's buffer).
Looks like you have a nice dark sky to work with.
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