Cragar SS wheels need constant retightening?

Being these are sbp cragars, I'm assuming you've still got the 7/16 lug nuts too. I've had bad luck on Dad's 69 lately with snapping the nuts. Busted 5 or 6 in the last year. Maybe we got a batch of duds, but I haven't been able to torque them any higher than 65 ft-lbs without them snappin. And YES they are a PITA to line up! LOL!