If the samplesize its 50-100 hands i wouldnt take the 20% 3bet stat for nothing.
And if he actually is 3betting 20%, he is probably a fish and wont fold, so its not in your interest to make a big pot pre with such speculative hand. You should 4bet him lighter, agree, but for value mainly, put some more 77-QQ AQ+ into your 4bet% range and crush him.

I don't think we should be afraid of being dead. If he's agressive, what do you think about XR flop?

Its quite unlikely he found a set there given the preflop action.

I agree with above that your 4bet range should have more 77+ and less speculative 4bets there.

Postflop I like the play. Represents a lot of strength and you will have a lot of value combos yourself taking this line. You also deny him river equity when he folds while you still have 25% improve against over pairs.

Those just look like stats that are over a very small sample so probably irrelevant. .

Not the biggest 3 bet - you have a nice hand in position - I think this is a call pre far more often then a 4 bet.

Once we 4 bet and get that flop I guess we want / have to try take this down with the equity we have. You might be right that slightly smaller on the flop would give us slightly more fold equity on the turn but I am not sure it matters a ton.