I have a mortons neuroma in my left foot and have had good luck with the Scarpa Charmoz. La Sportiva's are known as one of the narrowest boots so there may be several options for you that are better.
I was in a similar situation to you with trangos that were too narrow. I bought some LS Nepals and was much happier. A bit heavier but very comfortable. Cube version is lighter.
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