I don't think it was a great play. I like your thinking here about your M (essentially what you said about your orbits), but the reason you push with a hand like QTs is because of first in vigorish (as Harrington calls it). With two people ahead of you, one already all-in, you're not going to push anyone out. The big stack only has to call an extra 350 in chips, so why wouldn't he, even with a marginal hand just like yours? QTs is a wonderful hand to open push, but with 2 people already in front of you, fold and wait for another hand.