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Absolute weight has less to do with image quality than distribution of weight. My back-heavy mak-cass (f15) doesn't fair too well despite weighing only 9kgs. Nor does a 10" newt weighing maybe 14kg.
However, my TOA 130 which weighs in at about 18-20kg fully-loaded fares just fine.
There's some sense to the extra weight stabilising the mount - if the OTA isn't blowing around in the breeze or wobbling from inertia, then the mount can do it's job properly. As long as the load isn't stressing the drivetrain, a heavier package will actually help maintain stability in long scopes or scopes with long focal lengths (IMO).
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