I used WD-40 to get the coach screws all the way in. Together with an impact driver, they made it all the way in - 200mm !
I put some (temporary) brackets in to support the concrete form. I used packers to level it up - :). I estimate it will need to support the setting of around 100kg of concrete. BTW, have no fear. The wall is a solid re-inforced concrete filled wall. One N16 rod mesh at 400mm squares.

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