Betting for information is like 2000 poker. That's not a valid reason for betting. You can either bet to get worse hands to fold or better to call. In this case you 3-bet because your ahead of MPs range for value. A side effect of this is, the smaller the SPR is postflop, the easier it is to play.
If you want to play to just minimize your losses then what's the point of betting at all. Just limp or hit the call button, don't push equity. The only sizing for a bet preflop should almost always be pot. One of the few exceptions is abusing a shorstacker and making sure they can reopen action.
You actually want a fold preflop, that is going to be one of your better outcomes. Let's say MP is a complete whale and playing very very wide.
Hand | Pot equity | Wins | Ties |
---|
AcKcQsJs | 59.73% | 350,120 | 16,569 |
70% | 40.27% | 233,311 | 16,569 |
He still has the equity to call your 3-bet no matter your sizing. If he folds you are making more money than if he calls. You make 6.5bb in this spot if he folds, put that over 100 hands and 650bb/100. Let's say for the ease of use in this he calls and no betting happens after so no positional disadvantage. There is 8.5 in the middle and You win 60% of the time, so you get 5.1 over the long run. We then subtract that from your money invested, which is about $4 and you end up winning $1 which is 2 bb. You are making 200bb/100 in this spot if they call.
The more you raise pre the more you make in the long-run and if they fold you typically should be doing happy dances around the table and not being sad.