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Hi Pat,
Yep with NB filters on OSC, the exposure lengths go way up.
With Ha I do 15, 20 and 30 min subs usually, staying at ISO400 or 800 if possible.
When checking the histogram, make sure you are looking at the histogram for the red channel only (another press of the 'Info' button on the Da). If you only check the overall histogram, the red channel will end up overexposed and you'll have blown highlights.
I've never tried to combine Ha+RGB, so can't advise.
As for DSS, I'll also leave that to someone else, I tried to use it for a while and hated it.
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