You'll get contradictory answers here as well
but one thing is obvious: you'll submarine with this board in deep fluff with your stats.
I'm about the same stats (6'2", 190) and I ride a 161 most of the time here on the Ice coast and a 164 on my trips out west. And for deep stuff, I wish I had something in the 168+ range. Aside from stability, you'll probably find that a longer board has increased edge hold due to the increase in effective edge.
You should also think about why so many people have a quiver of boards: different boards for different things. Why get another 154?