Awesome. How long were your exposures? It makes me want to get out there and see what I can get. I've never had the patience to stack more than about fifteen minutes of light frames. Between coma and focus problems, it was just too frustrating. But I recently acquired a coma corrector and just bought a more powerful stepper motor yesterday, so hopefully I'll be up to the task soon (if I can figure out how to get the motor attached to the focuser).
Live view should be available for the K70 in PTP mode, but there's not much control over exposure/framerate, and I'm not sure whether Polaris would even be visible.
Aside from Bias frames, I'm not sure the updated driver would give you any different results--the main fixes were with the short exposure settings, so really only for planetary imaging.