Most low apm dps class and why ?

[Kolsykol]

It's definitely BLM.
I usually main mages in MMO's but in FFXIV my first job was Pugilist and I went back to it in Shadowbringers.
And I gotta say, as much as I love Monk my fingers begin to hurt after too long sessions xD...

BLM feels very slow and static when I play it now too, it sorta made me realize how slow they really are when I switched over again.

Edit: Btw, in regards to your carpal tunnel issue.
I'd consider my keybindings carefully too.
I can feel it in my wrists sometimes after long sessions when I have to hold shift for too long.