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Andrew this is a really hard question to answer, but I will try as best as possible.
I keep brightness down as low as possible (thats the easy part), in fact I keep it about 15%. Now as far as gain is concerned. I usually jack it up a bit to help with final focus. Then I lower it down so that it gives good brightness but not so much that I start burning out the image. I usually check after the first avi and run it through media player. That will show you straight away if you are under exposed or over exposed.
If you try as a general rule to maintain gain below 50%. That being said though, when you use a 4x or higher powermate this rule will need to be stretched. The main thing is that you don't get what you are getting now or are so under exposed that you get rings when the frames are stacked.
With a 3x barlow I use gain of around 20%. This gives a nice exposure.
Anyway try this if you like and see how you go. Everything is trial and lots of error. Hope I helped.
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