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Most sessions I’m guiding around or just above 1 arc sec when seeing isn’t that good or there’s a bit of wind around or I’m starting my image capture at low altitudes say 25 to 30 degrees. My guiding also improves when heading up towards higher altitudes too
I’ve imaged M83 with round stars when shooting 5 minute subs and my guiding is averaging out at say 1.3 arc sec and after a dither it can go up to 1.5 or 1.8 arc sec
If your guiding at sub arc minute numbers then according to my images you have nothing to worry about. Guiding figures of 0.2 and 0.3 arc sec error are absolutely astonishing !!!
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