Well, as with almost everything, it's highly critical on your riding style..the smaller board will be better in the park, but you are sacrificing stability. So a short board in this case will really screw you up with powder, and you would most likely just be entirely better off increasing the size. My stats a fairly close to yours and I ride a 159. You will notice a big increase in stability, as I said earlier, with the larger board. Honestly I don't think the increase should be a detriment to your park abilities whatso ever. I think the Agent would make the better park board for you, because if I remember correctly the Anthem was more of a all mountain board...Hope this helps..