As a youngish scandi i also struggle with aggro stereotypes. Still, id be too tempted to bet flop/jam ai. As played id shove turn as you did.

Any particular reason you checked flop?

I don't think image is too important here. We're not really trying to rep a stronger hand than we have, nor do we expect anyone to fold anything good. It's just a question of whether we have enough equity to get the rest in. My guess is that we do and we may as well bet-call it off on the flop, but this is exactly the kind of situation where PokerJuice tells the tale. Reasons to play passively could include wanting to get away from the hand given certain action, or inducing opponents to put in money with dominated hands. I don't really see those coming into play here, but you could maybe argue for a check-fold if the deep stack pots, for example. As played I think you have little choice but to shove turn.

I just prefer jamming the flop before you have to fold on bad turns having invested so much.

Check/calling or check/folding isnt the worst play because you can pretty happily call it off against BU and fold after MP bets big otf. I think when MP checks behind he basically says that he doesnt have KK here which is the main hand we are afraid at this point. We can easily call it off against BU but at the same time we dont want to give MP too good of a price in case he has drawing hand like QQJ10 or something like that. Obviously he can`t call when he has no flush draw to go wiht it. So I think you should re-raise to put some pressure on him.

There is dead money in the middle, just jam flop. Should hit his range rarely and put him in spots where he can fould some decent equity...