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As a lifelong sufferer of ingrown toenails and someone who’s been climbing for over a decade, I feel your pain.
Have you had them looked at by a doctor? I had one big toenail removed and the other partially removed many years ago but they still give me grief.
Climbing shoes and sore toenails are not a great combo :(
Make sure you soak the toe in salt solution or something similar after if you can - nothing like the inside of a sweaty climbing shoe to kick off infection.
(Sorry I can’t offer more useful advice!)
Would never recommend a shoe as it’s so dependent on foot shape. What works for one person would literally torture another.
Having said that, La Sportiva Python ;)