I don't know about "high", but there's at least two new things happening that jump out: * staggered start, the engines are started in pairs on the order of 100

I don't know about "high", but there's at least two new things happening that jump out: * staggered start, the engines are started in pairs on the order of 100s milliseconds apart, so 13 chances for an unbalanced engine start * vastly increased acoustic and vibration shock, I really wish I could hear the noise in person (from a long way away)