Ok so with no angle I have 2.1cm of over hang, so if i angle it 15 degrees it will be good right. If it matters my foot was 27cm exactly. And I will want medium bindings and not large right.
You want to figure at the inserts not the waist. AT the inserts (with a 27 cm foot) you will have 1.5 cm of overhang at Zero degrees. That puts you perfectly in the range of the board and will allow all common stances.