I am 6', 185, and the 138 has been fine for me.
I agree about it sticking stock... I took the fins completely off one day, and found that it sticks on edge without the fins... the deep rails hold well!!!
That's why I went to the .7s... I love the way it rides now!!!
It is very forgiving, except for the edges... you catch it and you are done!!! But that really applies to all boards...
I rode a buddies 01 Byerly and the Parks had more pop (I know they changed a bit in 02, so this may not apply to the new ones).