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I'm thinking that as I'm UTG, there's a big chance of someone else having an Ace with a higher kicker
you basically answered your own question here
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and I'd rather have KQ or something.
which I am definitely shoving here. btw your KQ only increases your chances by 10% (40% and not 30%) if any other player calls with a better ace not including AK or AQ
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If I go through the blinds, then there is a chance that it'll get folded to me on the button or CO and I might stand a better chance of a steal and I might get dealt a better hand in the meantime.
exactly. btw in CO I push your A2s
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Is going through the blinds just a really bad idea and I should be putting it in with worse hands than A2s? What sort of range should I have here?
depends on the situation and how the table is playing. I think that if you hesitate then it is better to fold and re-think later (and post in 2p2 obv). In UTG, UTG+1 at an unknown table I push 55+, AT+. If you have reads on the players then adjust with pushbot charts.
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If I had the same stack in the CO, how wide should I be shoving against non-regs?
Depends, against looser guys who call wide I tighten up, against weak and scared/timid/rock/nit players I push any pair, any Ace, any King, and connectors JT+. On BTN, I include Q7+, 87s+ against nits. Remember that bigger stacks may call you wider, adjust with pushbot what to shove for +EV if you can assume their calling range is approximately.
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Also one thing that always confuses me is how I should be thinking about the short stacks. Am I happy to shove in front of them because they will be more deperate and calling really wide. What about the medium and big stacks. I suppose it depends on the players, but in general they might think that I'm shoving quite wide and calling, or they might want to protect their stacks.
I basically answered it above, but to add sth remember about your reads on the short stacks. On top of guys like 9/5 or 7/3 I tend to push almost ATC if I am on BTN and they are on blinds. Some of them will become rock tight and wait for a hand (like 99+, AQ+), using HUD will help you. If you see a short stack guy pushing a lot IP you can assume he knows what he is doing and is reggish and not fishy. Try to figure out what they can be pushing and try to adjust. The big stacks that fear for their chips are also to be abused relentlessly, you have to build your stack and every steal increases it by 20%, sometimes it is a risk you have to take to reach FT and a better payout than a min cash.
I know this may not answer everything but I hope that at least I helped a little. You guys have anything to add/correct?