i like to take rough seas at a 3/4 angle, trimmed down. lengthens out the back of the wave and time in the "Valley" to get some speed. trimmed down keeps it locked to the water. Tres goes over rough water handeling in his class. I highly reccomend it.
I usually find myself running in 3-4' "washing machine" type slop. in which case, find the path of least resistance, tabs down. bow lift is your enemy then.