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I have seen mention of smaller scopes being less effected than larger ones due to the size of individual "seeing cells", which are supposedly cells of calmer air. The idea being that smaller scope can view inside a smaller column of air and not be 'straddling cells'.
Sounds like a load of hogwash to me.
What does affect larger scopes more is thermal mass of the optics causing a temperature difference between the optics and ambient air temp. If your mirror is > 1 degree away from ambient, the seeing will always look poor regardless of how good sky conditions really are. Fan forced cooling and ventilation can help here.
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