Poker Stars, $0.10/$0.25, $0.05 ante No Limit Hold'em Cash, 7 Players

SB: $69.81 (279.2 bb)
BB: $21.45 (85.8 bb)
MP1: $33.33 (133.3 bb) >>> Unknown 1 tabler fish 67/0 over 6 hands lol
MP2: $22.45 (89.8 bb)
MP3: $59.68 (238.7 bb)
Hero (CO): $62.50 (250 bb)
BTN: $91.80 (367.2 bb)

Preflop: ($0.35) Hero is CO with T 9
MP1 calls $0.25, MP2 folds, MP3 calls $0.25, Hero raises to $1.25, 2 folds, BB calls $1, MP1 calls $1, MP3 calls $1

I don't mind going ISOing being IP multiway with a SC, seems like a great spot to do it.

Flop: ($5.45) 9 7 7 (4 players)
BB checks, MP1 checks, MP3 checks, Hero bets $4.25, BB folds, MP1 calls $4.25, MP3 folds

I'm unsure I sized this correctly, I want to charge flush draws as much as I can but at the same time, I only get called with by better 9s and maybe Pocket 88s, I don't mind taking the pot down as it is so instead of 4.25 should I have bet something like 3.25 for pot control?

Turn: ($13.95) 3 (2 players)
MP1 checks, Hero bets $8.50, MP1 calls $8.50

We get a blank and MP1 checks again, I think MP1 takes this exact line with flush draws and a 7 and a better 9. So is betting still correct here?

We're obviously folding to any sort of raise or pressure, so should my size be a bit smaller in case i do get c/r when has the 7?

I get called by better hands and worse hands in this spot... so better to check back.. or not?

River: ($30.95) 3 (2 players)
MP1 checks, Hero checks

He missed his flush if was drawing and isn't going to call a bet with worse now, however it feels like I essentially bloated up a pot with a really mediocre hand.

If he donked any amount on the river I would be forced to fold as I don't believe an unknown fish is doing this with a weaker hand.

I made this pot less than 1SPR on the river so.. feels like I did something wrong?

Any help on any of the questions I asked would be much appreciated.

Thanks.