Good info. You will want to use a medium binding and start with the in the furthest back position in the slide that is just over 1 inch. That will be the best starting point. From the looks of it you are working with a 25.5 cm foot and a 25.5 cm board (at your stance witdth). That allows of no barefoot overhang with any stance angle. That is what we have to work with so this is a precision operation
. It is most important that you center your foot, not the boot or the binding. Please send a photo of the boot that you will use once you have it mounted with the medium binding as above and we can fine tune.