Broken rocker arms two weekends in a row

That looks like fatigue life failure, or way too stiff a spring failure to me. Since it's been running for so long on those springs..... I'd guess fatigue life. The more spring, the sooner the rockers will fatigue.
It looks like a serious offset to the intakes. I would see if i could get eight of the non-roller bearing HS version that Mancini sells, and keep the high dollar offset intakes.