A. We usually want to overbet turns where we are uncapped and villain capped
- KJ37 is a good example. The offsuit 7 doesn't improve villain to anything else than a set of 77 and some 2 pairs villain will have almost 100% of the time. If the turn was a Q we can almost never overbet because villain will improve to a straight with AT/T9, and also a lot of 2 pair hands.
B. On blank turns I usually only have an overbet or check. On more equity/nut swinging turns like a T/Q/J/K or third flushcard I mainly have 2 sizings. (33)/50/75.
C. I don't know about different OB sizing but i personally use 1.3x or 1.5x pot. In some OB probe spots I go 2x pot.
I very much disagree that we want to use one sizing. It simplifies the strategy but you are overly limiting your options. There are a lot of hands that may benefit from betting but don't want to overbet, for example hands that aren't really strong but need protection, and maybe strong hands that unblock the raising range vs. a small sizing. I think this is even more true on the river.
If we bet on the flop and the turn in several sizes, I think we make the game very complicated, so I think that choosing one sizing on the flop and turn is better since we are not bots but people. That `s my opinion. I'm looking forward to yours
BTW: My strategy is to mix.
For example:
1hour I play strategy when I bet turn only with sizing 66% of pot and then
1hour I play strategy when I bet turn only with sizing 150% of pot.