Wow I had no idea lol!!
Ok so they are crowntooth blades i want to say Olsen brand... was using size 9 which I thought was overkill but the 5 broke... trying to cut 3/4 inch pine (I think its pine) went through 4 of the size 9s so went back to the 5 and had no further breakage. I was also using the tention until I heard the ping like the youtube guy showed me. It was breaking down at the bottom just above where the teeth start. One of them broke after a few seconds.
So maybe a bad box of them?
Could I be pushing too hard?