It depends on the goal of our cbetting strategy and on the ranges in play. Small bets on some board conformations (2 broadways f.ex) don't generate enough fold equity to work well in multiway, but they work wonders on drier boards like A 7 2, K 8 3, etc.

On that texture we prefer to play a polarized range, it's also the most effective way to punish preflop mistakes that recreational players are more likely to make (calling too many suited and offsuited broadways).

1) No, it becomes a completely different spot, ranges are way tighter and villain is not supposed to get all the money in with AQ -even overpairs can be too thin-.

2) That spot works best as bigger bet on the turn, always giveup river, against the rec the small bet accomplishes almost the same thing, but makes us save some money when we're up against Ax. On blank rivers if we want to bluff we want to have QJ QT, blocking AQ, KQ and JTs. TT only block straights, but doesn't block any two pairs and it blocks some of the weakest pairs that are always folding to a river shove.