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I vote keep the ISO at 800, and push to 10 minute subs.. yes noise will be an issue, but take darks, that will help alot... ICNR will take darks at the same temp as the light, which might make things better... ISO400 @ 10 mins will give roughly the same result (in signal) to ISO800 @ 5mins. You really want more signal, so I'd push for 10min ISO800 with ICNR or darks shot at nearly the same temperature, get as many as you can, and then after you stack them, layer in the 5x5min subs you have from this attempt.
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