I think you're doing everything right already. As long as you follow the usual DSO rules. Get away from LP, high elevation ASL helps. Photograph it as high in the sky as possible etc.
2014 Q2 has mainly an ion tail which is more subject to solar wind so it changes fairly rapidly over even a few minutes. There are two ways to photograph it. Either keep the total exposure short to "freeze" tail motion or go long for a smeared effect. It's a bit like waterfall photography. Short total time make for a frozen effect and longer time will make for a "flowed" look to it.
Just make sure your individual subs don't have too much motion.
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