I think part of moving up in levels is you're nervous, even if you're bankrolled okay, just because it's for more money, and it's outside of your comfort zone, because you used to be beating the previous level and now you have to start over. I just moved from .5/1 to 1/2 (not on Party though) and there's definitely a difference but it's manageable. Mostly I've started always raising if first in, stopped playing weak suited aces unless a couple other people are in first, stopped coldcalling preflop (either fold or 3bet), and started being a little more aggressive with my pocket pairs and also in general. I know this doesn't really respond to your post but I am trying to make the adjustment too. Anyway. On your hand I feel like you're probably losing to a pair of aces or maybe the flush got there. Either way I'd call it down. Good luck!

BBB