nitrous oxide on a hypereutectic pistons

I have sprayed upto a 200 shot on an old school Mopar Performance reman 360 short block. They had hyperutectic pistons, Im pretty sure they were Speed Pro pistons. I did make several passes with a 150 shot. And I was also running 6psi of boost from a Roots style blower. Lol
I had alot of street time with a 75 shot, to act as an intercooler and to make for a dense air charge.

The skirts failed on 3 pistons from hi RPMs, IDK how many RPMs as my tach only goes upto 8000.