109o is just too awkward to play oop. I'd fold it pre. 

As played I'd just c/c with your oesd and overcards and also as a float oop. If he checks the turn behind you can lead out on the river and still take it down. By c/r the flop villain could 3bet and you'll have to release your hand while having a draw. Might prefer a donkbet and possibly take it down on the flop. If villain calls you you'll prolly have to check the turn and fold to a (big) bet as you might be up against a flush or a K leaving you only with the oesd but w only 6 outs instead of 8 as villain might have a spade in his hand or two in which case you're drawing dead.

It's just a really tough spot which can easily be avoided by folding pre.

I think these days deep in MTT's a lot of people look purley at pot odds when facing a raise pre. Especially from the BB when someone min raises and your getting 4 to 1 or whatever. Playing OOP against LAG opponents with marginal hands is asking for trouble, and more often than not when you play the hand out and lose, you give the villain a false opinion that he has a skill edge over you the more it happens and this may change game flow (which is real important late in MTT's) b/c he's going to keep doing it!

It's fine in some circumstances but it may be a leak to do this too often i feel

in saying that, i would fold pre too

As played i would not c/r this flop as again we are building a pot OOP on a weakish semi-bluff

I would c/c here and re-evaluate turn. If another spade comes, a lot of the time we will get to the river anyway b/c he's scared of the flush

If he 2 barrells we have an easy fold

agree'd

adjusting to steals of our BB is not achieved by flatting but widening our 3betting range

of course we are OOP but in 3bet pots the villain isnt going to be floating much at all and therefore our C bets should work more often

that leaves the ball in his court to either widen his 4bet range or nit up himself and stop raising our BB (which is the sole reason we change gears and do this)