Gday Steve
Just set the pier on a centrally located shim such that there is about 1 inch of clear space under the base. Use the bolts under light tension to set the pier to the position you want then just use a dryish grout mix to pack fully under the baseplate. ( Google "Dry pack grout" )
Once dry, just tension the bolts properly
The rest of the 1 deg slope can then be left alone to assist with drainage.
Andrew
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