I'm 185 lbs, ish and have the Proto 154 CT (US9 feet) but at 180 lbs, on paper, most people would recommend 157 I reckon. That said, there are advocates for the shorter board!
The 157 would give you that little bit more stability when landing - if jumps are your 70%. But unless you're hitting really big jumps then I can't see why you wouldn't opt for the Evo. I rode one that was definitely too short for me at 151 but it was plenty stable enough bombing down the slope and even landing some 20 footers. I will be taking the Proto all mountain and over big jumps (for me - 40'+) and making the most out of it!!
The Proto won't be your pure park board surely?? Even the Evo is too good outside of the park to restrict it to one area!
What are your other boards? What size jumps will you be hitting?
I'm not sure what these are like for landings but these have all come up as great park boards.
Signal Park Rocker
Arbor Blacklist (when it arrives)
If it's a real goose, is it propaganda?