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My testing with my SXVR-M25C and an NEQ6 have shown, as you have, that subs below 5 minutes are optimal - my optimal figure was around the 3.5 minute mark in nil wind - to avoid slight elongation.
The image below of M83 I did was similar to yours in many respects. You can notice very slight - yet to me unacceptable - star elongation as these are 5 minute frames.
Having switched to a Vixen GPD2, I will have to retest to achieve optimal, but with a PEC of apparently sub-15, I am anticipating at least 4 minutes per frame (fingers crossed). Also using a 50mm guidescope.
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