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Mark, Nice looking image...
I have the same issue, my RGB exposures seem to focus up a lot tighter than my L exposures.. I'm using Astrodon I series. I think this is because each colour filter cuts out a great deal of the light bandwidth where as the LUM filter allows in everything except UV/IR.
If you run some deconvolution over your Luminance frames you will see them sharpen up nicely.
As for your exposure times, I think 6min subs are a bit short for the rosette.... for colour its fine, but for the lum data I'd be looking at 10 min subs...
Colour data is generally unimportant... as long as its calibrated well, its pretty forgiving... In one of my recent images, a 5 min bin 2x2 sub didn't even show the target, I only took 3x5min per colour channel and the colour balance ended up fine... Luminance is life.. get as much Lum as you can...
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