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You've gotta be happy with the mountainjoo. Maybe do a mix of exposure lengths to retain detail in the highlights (tighter, colourful stars, etc)?
Doesn't look like you need flats, but I always find them useful - at least to remove dust halos and such. I would use more calibration frames than you have here to reduce random variation. Bias are easy to take (nearly 0 second) you can generate lots of them. I use 100 and it really helps to cut down on the noise level in the final image. Darks and flats I use 50 of each.
I'm really envious of your setup. Having an oversize mount and autoguiding you should be able to get very long exposure subs if you want.
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