I don’t think this is necessarily a massive mistake, but I do think you’re better off taking DIDD’s suggestion and 3-betting to a size that covers the short-stack. I probably wouldn’t fold to the BB either tbh, since it’s a spot where he should be pretty willing to show some aggression with worse hands than AJs.

There’s really not much cause to worry about risking your stack versus 2nd in chips when you’re still a long way away from the bubble. The ICM value of the bounties matters much more at this stage than the ICM value of any change in your chip stack.

DuckinDaDeck said
 3bet is handy because his jamming range will be a lot wider than his 70bb call range.

Yeah, this is really important. Our best bet here is to do whatever widens BB’s get-it-in range, and he’s certainly shoving wider than he’s calling off.

KableTownCEO said
Cool, makes sense guys. Thanks. I admit I was concerned with getting into more flips by 3betting, or playing postflop in big pots. I shouldn’t be concerned doing that.  

Try not to use words like ‘should’ or ‘shouldn’t’, try to just take an introspective look at where the concern comes from. Is it fear of making a mistake? Fear of how you react when you realize you’ve made a mistake? Fear of losing money? Usually there’s a fear that creeps in somewhere. Digging into the heart of it can help resolve a mental game leak you didn’t even know was there.

‘Should’ and ‘shouldn’t’ tend to end up placing unnecessary mental game pressure on yourself – you make a mistake, and it feels like a double mistake because you know you ‘shouldn’t’ have made it. Mistakes happen – focus on learning from them, rather than on how your game ‘should’ be.