Disclaimer: PLO is my worst game, and I know even less about capped games.
QQ with a suited ace has good equity against even the top 20% of hands. You should probably be looking to stack off preflop with aces, kings, and good queens that won't be dominated.
Also, a lot of your money is going to be won from players like Andrea who calls a big 3-bet with a speculative hand and folds. Since the betting is capped at $2, he'd have to be pretty crazy to fold many flops.
So yeah, I like the 3-bet. Its likely getting close to the bottom of your value 3-betting range, but I think its passable depending on how often Augustine opens.
Also, stop posting the results 2 hours after you post that hand. In fact, you shouldn't even post what happens on the flop, because obviously you flopping the nuts is going to bias people's opinions of the 3-bet pre.