11 month old with a bad latch

[NicNac]

Probably won't be too much help, but have you tried teething pain relief a little while before each feed? Or use something like brauers? An amber necklace all the time? Cold flannel to chew on before feeding?
We had some minor attachment issues through teething and I used to say "open wide" and really concentrate on correct attachment (she was at the age where she could understand and would open her mouth wide). Worked for us but as I said our issues were minor.
Hope this helps.