If I were you, I would suggest you forget about trying to generalize your pow skis in the park. The construction as well as the atributes that make a perfect pow/all mtn ski good are not necessarily the same as a park ski, and if you sacrifice for the park, then you will pay for it on the rest of the mtn. As you already have a dedicated park ski, I would suggest you look for something based on its all mtn handling, not its park abilities. Also, do not buy a ski under 100 at the waist. With the performance of skis these days, you sacrifice nothing on groomers but gain soo much fun on pow days.
I bought a pair of Scott P4s this year in a 181, and I love them to death. They are 104mm underfoot, a perfect number because they rip forwards or backwards on really anything I have thrown them at (aside from rails and small jumps). I am 5' 7"200 lbs, and these are about perfect for me. Because of your height, you could probably ski the 191 if you are a stong skiier. These skis are slightly hard to get, but if you can you will enjoy them.
Other suggestions: JP vs. Julien 188, Ak Enemy 189, VCT 185, Surface Live Life
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