Hi Jason,
Yes I agree, some top plates do seem compromised by tiny bolts. Thats why I would use four rather large 15mm bolts for the middle plate. The top plate is then held by contact to 3 large balls plus 3 medium sized bolts. Also I will strive to keep the distances between plates minimal.
My understanding is that the bolts are less of an issue when close to the mount. If the levelling was done at the bottom of the pier for instance they would be more prone to flex.
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