Replying to Adjusting Pivots for New Boots

Hi all. Recently upgraded boots, going from some older Tom Wallisch pros to some Dalbello Il Moros. BSL was one mm more on the il moros so figured it wouldn’t be an issue to adjust, but I have loosened the pivot heel piece from the end of the first grooved ring to the end of the third grooved ring and the boots still won’t fit (both are size 28.5 if that helps). Has anyone else had this issue / do I need to remount? Thanks in advance.