I have wide a forefoot (100mm), very high instep, low arch and not very prominent ankle. One foot measures 25mm in length, the other 25.5.
My old boots were Tecnica Cochise Pro130. They were 100mm wide in size 26 which I needed to get enough volume and initially needed buckle extenders to get the 3rd buckle from the toe done up, punched at baby toe. They had great heel hold down and initially made my heels feel a bit numb.
My new this season boots are Head Advant-Edge 125. They are "Form Fit" which means the shell with the liner in the boot (but not the foot bed), get heated in an oven and then with the foot bed inserted, worn for 15 minutes.
These boots are 102mm wide in size 26 and 100mm wide in size 25, which is my correct length.
I work in a demo centre,so I order boots from the rep and do my own fitting. (I did find a pair to try on at a shop in whistler prior to ordering) Initially I needed a buckle extender to close the 3rd buckle on the first try on of the brand new boots but things compressed enough after that that the buckle extender was not needed. However my toes where numb after 20 minutes, but I kept them on for about 40 minutes.
I gave my feet time to recover by waiting until the next day to try on liners only. Toes went numb again after 20 minutes, so I decided to stretch the liner toe box. A jar of Snow Seal seemed to be the correct size, so I jammed it on its side as far up into the liner toe as it would go and then left it overnight. The next day my toes did not go numb so I skied a few runs and the boots felt pretty good but pretty snug.
I was told that the oven heating process tended to create room in the boots which was what I was looking for. I did not need to get these boots punched, they seemed just as stiff as the 130 flex old boots and no further adjustment needed. I started out with ultra thin socks and ended the season still wearing the same ultra thins after about 40 days in the new boots.
While at 125 flex, these boots may not be stiff enough for the OP, these days Nordica is also offering a 102mm wide in size 26 boot with a 130 flex called Sport Machine 130.