I find in the late stages of STT's (6,5,bubble,ITM) that the important thing is First in Vigorish (FiV). I don't want to be calling light, I want the others to make mistakes.
OP deals with when that FiV should happen, and under what circumstances. We should all understand that most villains who get that far in a decent buy-in STT are not noobs (occasionally a luck sack will get that far, but not all that often). They understand most of the implications involved here.
That said, and the math explained, our reads will temper our math here fairly often. We sometimes will want to bypass a prime opportunity to let the small stacks quibble their stacks away. We may want to let the small stack work on the medium stacks.
But the opportunities at the 5seat and bubble time are great and I think what OP is aiming at is the math involved, not the tempering reads we got.
He mentions several times about the FiV of the situation.
If we extrapolate just a bit, we end up with many hands that are essentially HU hands, even with 6,5,4 seats left. Or we can effectively (more so than at a full/nearly full table) proceed as if it is a HU situation. We want no more than a HU situation at any time. So with the big stack we never want to be flatting without monsters in any position.
As for 3 betting and shoving, either light or heavy. 4 handed you might not want to do that against the shorties, they realize their situation, and know if they are gonna survive it will have to be thru the big stack, you!. Just as the big stack can shove ATC, so can the shorties. They've got nothing to lose. If we know a shorty has that much savvy we adjust accordingly. If we know the shorty DOES NOT have that much savvy, we also adjust, probably turning the aggression dial way up against the unsavvy player.
If we are middle stack? This is where the real challenge lies. 4 seated, MS (middle stacks) are keenly aware that they don't want to be doing stupid stuff. So they/we will not get into a challenge with less than very enticing opportunities. Bigger Ax+ in position, or broadway's AND FiV oop. This is way more important in turbo's where if you blink you may miss a whole blind level and be forced into stupidity.
With 5 seats left, the pressure is off some from the impending 4 seat situation and offers a few more stealing opportunites. But again, IMO the important factors might be;
2-Stack sizes (and table images)
and in that order IMO. Position at short tables will tend to affect 3 betting more than openings.
Many folks will avoid the hard math, I might be one of them to avoid the details, but I do understand percentages, which is what the equities are about. I won't go 3 decimal places, 1 works for me, or occasionally 2. It is usually easy to understand that you are or are not the big stack, and what will need to happen to get u first ITM, and then up the pay scales to a win.
The OP here is showing us that we really need to think about our stack size and how it relates to the dynamics of how each hand is played at a short table.
Another tactic a big stack might use is taking a long time to play. Especially in turbo's. Knowing the blind levels will help add presure on the shorties can be a powerful tool. As shorties in MTT's will often delay at the bubble to let other fools on other tables make mistakes, in a turbo STT, delay is a mistake for a shorty. Shorties should want to see hands at the lowest possible blind levels and as many hands as they can see before the blinds go up.