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Flex is not an issue (IMO) as the mount is balanced (by definition..) and it is constant (in case there is unbalance present in NS direction).
More important is possible oscillation of the whole .. and the rigidity axial to the bolts will be quite sufficient.
So I wouldn't worry (and I don't, since I am buildint it myself like this - I have even smaller screws, and 3 only)
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