you bring yourself in difficult spots.
first of all, OOP is not good in PLO.
power of position is worth gold in PLO.
you have a very good defending hand, but when you 3bet him preflop, you are OOP and in trouble.
anyway, as the Preflop aggressor, you should cbet this kind of flops always like 33-45%,
because your opponent have to fold a lot, since he only can continue with a J, 99, J9, or maybe QT and flushdraws. but, most of the time he will fold to your cbet on paired flops like this. but this situation is a little bit more tricky, because he has a lot of wraps in his range like QTK maybe with flushdraw too. anyway, bet the flop is ok, but since he call the flop, give up the hand, dont barrel again, you might be already drawing dead.
if you would had just called his raise preflop, you could lead the flop or check/raise the flop, and easy take down the pot, or fold to a raise/re-raise. of course you can 3bet OOP to balance your hand ranges, but as you can see, you come in tricky spots OOP so be careful since you are a lot dominated from other hands with your AT87ds