Cavity Slider Crooked Wall

Hi I hope someone can help! I am installing a cavity slider in the bathroom wall. I have cut the opening and installed a lintel and jack studs (Loose) and checked for level and plumb. My problem is the wall runs out about 6mm from the bottom to the top. How can I rectify this? There is hardly any fudge room as the cut out is 1375mm + 90mm for the 2 jack studs and the room is 2m wide. I am unable to remove material from the corners to plumb the wall up as the side walls are sheeted. I need to install the door plumb and level. Any help would be appreciated :~


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