Replying to Bentchetler 120s breaking + Pivot question

Hello Ns,

Over the past few seasons I have broken a couple of pairs of Bentchetler 120s in similar ways.

The core keeps breaking where the bindings are mounted.

The bindings are Look Pivot 15s.

Both times I have successfully received a warranty pair. I currently have an unmounted pair in my living room which I'm realizing I should maybe consider trading / selling as I don't think there's a warranty on a warranty and my track record has not been good.

I am not skiing park with them, for the record.

Our local wizard tells me that he feels it's likely because the bolt pattern on Look Pivots are 35mm. Apparently most brands have gone to 40mm, and Pivots are soon to follow suit.

From my understanding, he's saying the forces exerted on a 35mm bolt pattern are spread over a smaller surface and this leads to me breaking the core.

Anyone know if the bolt pattern is changing? Anyone experienced something similar w the core breaking where the binding is mounted on Pivots or any other binding?

I am mounting at -1 from true centre. Is the core stronger at recommended?

Thanks in advance.