I would suggest reading the service manual procedure that can likely be found at LINKY!!!!
That will guide you on setting the pre load for both used and new bearings.
The marks you made on the adjusters are likely of little use mainly due to the differential being changed as well as the bearings, although the bearings "SHOULD" be the same.
Having not measured the backlash is more of a potential issue but not a show stopper. I, once again would follow the manual and set the backlash in the middle or a bit towards the loose end.