Elsewhere we've gone for the bonding and fill up the gap route but this one is sloping into the room quite a lot (the others were just a bit wavy) and I'm not sure we'd be able to fix it level without sorting out the surface a bit first.
pick the height required,and using packers then level the board when happy either gripfil the packers in place and board down onto packers or drill and screw,then foam up gap.
or hard wall and level off,when dry fit board.
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