And I mean supersmall like 10-20% pot. Have been doing this a lot lately and get called a lot by superweak hands. Thoughts?

Example: (Villain is obv not strong as he can't check this board twice with a decent holding so I think he has something like a low pp with a heart or something like the Ah (maybe Ahkx) or maybe something like middle pair). He calls me down ace high which he would have never done if I would have bet 60% pot on the river.

888 Poker - $0.10 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 4

BTN: 86.4 BB (VPIP: 28.26, PFR: 13.04, 3Bet Preflop: 5.26, Hands: 48)
SB: 99 BB (VPIP: 27.87, PFR: 21.31, 3Bet Preflop: 4.00, Hands: 61)
Hero (BB): 132.3 BB
UTG: 100 BB (VPIP: 30.77, PFR: 23.08, 3Bet Preflop: 0.00, Hands: 14)
CO: 39 BB (VPIP: 18.75, PFR: 18.75, 3Bet Preflop: 8.33, Hands: 102)

SB posts SB 0.5 BB, Hero posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has 9 Q

fold, fold, fold, SB raises to 2.5 BB, Hero calls 1.5 BB

Flop: (5 BB, 2 players) J Q 8
SB checks, Hero bets 3.5 BB, SB calls 3.5 BB

Turn: (12 BB, 2 players) 5
SB checks, Hero bets 7.5 BB, SB calls 7.5 BB

River: (27 BB, 2 players) 4
SB checks, Hero bets 3.5 BB, SB calls 3.5 BB

Hero shows 9 Q (One Pair, Queens)
(Pre 37%, Flop 63%, Turn 77%)
SB mucks A K (High Card, Ace)
(Pre 63%, Flop 37%, Turn 23%)
Hero wins 32.3 BB

You can do it exploitively and it is going to be part of a winning strategy at any stake

Similar to the hand which you posted and the pot OTR is $2-$3, albeit less scary boards where hero knows he's ahead and villain must have missed or is really weak. I've found betting around 80c (anything under $1 really) into $2.50 etc often gets calls from any pairs and Ahigh, Khigh draws etc.

I wouldn't do this against a non-fish because it makes you unbalanced. Balance is much, much, much more important then an extra 3 or 4 bb's in a random hand.

small/thin bets are really good against a lot of passives that will only raise it with really strong hands. i don't ever bet quite this small though.