[ValarMorghulis]

Bet sizing based on your hand
I think you are giving away too much information for not much gain by varying your bet sizes due to your hand. For example UTG, a lot of people have a narrow hand range. If you then split this hand range into sub-categories then you are giving too much information away to an observant villain.

I think raising just to build the pot isn't a great idea, so I don't like small bets just to juice up the pot (especially considering we're not normally deep and there are often short stacks at the table.) I think we should either raise for value or for fold equity (future and present) or deception.

Bet sizing based on the table.
This sounds fine. But figuring out the right table for the right bet might not be too easy and the table dynamic can suddenly change with one of two opponents.

Raising based on your position.
This is an interesting idea. If your UTG range is narrower you could bet more to get more value from your good hands. The only problem is the whole value versus fold equity conflicit which might tend to make the bet sizes the same.

Raising based on your stats.
This was mentioned above. The only thing is that loose players may have worse cards but they want more fold equity.
So you get the same conflicit between value and fold equity which may tend to make bet sizes converge.