I think tightening the heel is what they would do.
maybe some c pads so your heel cant move (blisters come from moving in the boots)
bootfitting over the internet is pretty much impossible.
Moleskin, originally referring to the short, silky fur of a mole, is heavy cotton fabric, woven and then sheared to create a short soft pile on one side. The word is also used for clothing made from this fabric. It is also used in adhesive pads stuck to the feet to prevent blisters.
Clothing made from moleskin is noted for its softness and durability. Some variants of the cloth are so densely woven as to be windproof. Most manufacture of this cloth takes place in British mills. Noted clothiers who use a great deal of moleskin in their garments are Barbour and Lambourne.