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Don't be too obsessed with the pier. It should be reasonably vertical but it isn't that important. There should be very little lateral force on your pier when the scope is balanced on the pier and slewing creates very little lateral force. Most of the force is straight down. Stiffness is important as this reduces movement from wind etc on the scope.
The top of the pier doesn't have to be perfectly level either as you will adjust any error out when you polar align the mount. As long as the mount will balance safely on top of the pier it is ok. Think about a mount on a tripod. You can still easily polar align even if the tripod isn't level.
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