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I think the 8300 would be good with only ~10 minute subs on your 12.5". I've only done a couple of LRGB images with my STT-8300, NGC253 was 10min bin1x1 L and 5min bin2x2 R, G, and B, and that was with my TSA120 so nowhere near the aperture of your scope.
I always do 30 minute subs when I'm doing narrowband though.
If time is really tight for you then you could sacrifice some resolution and use binning to speed up acquisition of dimmer objects.
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