I like most of what you're saying. 30/60 is about the time when the blinds are worth having, except by this point, if you've been folding pretty much until now, your stack's going to be around let's say 1100. Sometimes it'll be more, sometimes less if you had a couple hands to play earlier that didn't work out, so I just picked something in between. To make a standard raise of 3xbb, then cbet 1/2 pot, it's going to take 405 chips, leaving you with a pretty hurt stack if you don't take it down. I prefer open shoving once the blinds are worth having, and your M's floating in the 12ish area. There's a couple reasons for this:
1) You're very likely to win those blinds.
Obviously someone's going to need to wake up with a hand to call this bet. If they do, well that's too bad, but you were going to have to win a hand sometime to get into the money anyway.
2) Image boost
When you've been tight this whole time, and suddenly shove all in, people are probably snickering at you behind their monitor going, "The nit finally got aces, lol. Played em like an idiot" So at first, these shoves are going to be really effective. However, after a few orbits, they realize, "No, this guy's just gone crazy and he's shoving anything he thinks is worth playing." This is going to be handy really soon.
3) Blind are about to be worth even more
30/60 is when the blinds start being worth fighting for. But pretty soon, they're going to be huge. Now shoving has become the correct mathematical play for mostly everyone (whether they know it or not is another story) but since you've already been shoving, your shoves are going to get less respect, which sounds bad, unless you're cognizant of it. Now back off a bit, be aware of table dynamics, and mostly value shove. Other player's stacks are going to be getting in trouble, and they will realize this, likely leading them to calling off their stack light. Now when you shove AJ, they look at AT and think they have you crushed (after all this is the idiot who's shoving anything he plays). So now when stacks are contested you have a better chance of being a favorite with hands that, had you been nitty till now, probably would not fair so well against a villain's calling range.
As for getting aggro on the bubble, I don't like that save one exception, if you are the chip leader
It's the chip leader's prerogative to steal the ever loving god out of everyone when it's the bubble. If you have a middling stack, then your job is to stay the heck out of his way as he steamrolls the small stacks, sliding you into the money. If you are the short stack, or become the short stack, then you simply have to double up or go home. If you have a middle stack, don't get fancy here, because if the short stack doubles through you, well then you're going to find yourself possibly outside the money when there was absolutely no need.
Once you're in the money, it should be fast and furious. It's purely making +EV shoves. The blinds are likely massive by this point, and you simply need to get some good spots to shove in, and either take down the blinds or run a board and see what happens. Waiting for one of the other two players to be knocked out is going to end up slowly draining your stack, and lead to a lot of 3rd place finishes. You make money in these tournaments by winning them, not by making the money. Play tight/aggressive as I've laid out previous to the money, then once in the money, stay aggressive and be willing to gamble to move up the payout structure.