I think we need to be raising the sb a large percentage of the time when we are getting deeper into a tournament, because picking up those extra chips is so crucial. Basically raising with any two is profitable, at least in the lower/midstakes because people just fold to often and don't 3 bet enough. There are some oppenents we should be more selective about what we raise, but that's only if they are going to flat most of the time, or if they are a better player than us. If they have a skill edge then we will be losing money playing postflop against them oop. I think we should raise a bit more than a minraise, but it doesn't have to be much more, just enough to discourage calls a little bit more. Something like 2.2x is plenty. I think more than 2.5x this shallow would be a mistake unless we are doing it for value against an uber fish.

As played, I think I would be double barreling this board most of the time. I agree that sometimes we need to be checking our value hands for balance, but I'm more likely to check like 810, 910, j10, 88-99 or the weaker end of my value range. With a hand like k10 though we can comfortably barrel 3 streets against most opponents. People will call us down with weak top pairs or even middle pair bvb because they just wont give us enough respect as opposed to if we had raised from a different position. We also dont want him to be able to check behind a hand like 910, 810, 78, 79, 68, etc. He would most likely call a bet with all those hands, and we are letting him see another card that might give him the best hand, or kill our action. If he checks behind and another overcard falls he may not be calling another bet with a seven/six, but would have paid us off on the turn.

Don't get me wrong, I don't raise every single time from the small blind, but its a super profitable spot to pick up chips. We only have to get through one opponent. In this hand there is 1440chips in the pot preflop. If we raise to 1350 (2.25x) then we are only risking  1050 chips to win 1440. So the bb only has to fold 42% of the time to be profitable. Even a super loose player has a hard time defending with 58% of his range. That's if we were raising with garbage everytime, but of course we will have stronger hands some of the time as well that we want to get action with.

One of the other times where I tighten up my sb opening range is if there is a big stack in the bb who isn't a nit, because they are likely to flat even a wider range, and float our cbets on a lot of flops putting us in difficult positions on the turn. however, in the situation above where we have the villain covered, and he only has 25bb, I'm probably going to open like 80% of hands.

Gameflow is important, and there are times when I decide to give a walk, or pass up a good 3 bet spot because I have been really active the past orbit or two, but I have a hard time giving most opponents (unless I know them to be good players) credit for paying attention to gameflow and exactly how active I am. Even if they are annoyed about it, they probably arent going to fight back a lot with complete air preflop.