More than anything, it's dirty.Are you saying they are super hard?
On my stock 50cc mtronic and autotune saws I run 18x325 semi, that way I can get at least 2 tanks out of them unless I hit metal or totally mess up and hit a rock or concrete . Ported 50s get 20x3/8 and they will hold up to a lot more abuse, so they last at least two tanks. The only time I normally dull a sharp chain other than hitting metal, is when flush cutting stumps.
RS PRO 😉
It's okay, but I won't be buying anymore.