JKDS, I'd bet the flop a bit harder probably to .45 or .50. reason being, Ireally don't think either will fold a T or better for this sizing very often at all and probably not Qs+ either. There are also a bunch of hands that think they have decent equity yet obv don't at all like 8s8x 9s9x etc. So yeah there's plenty of hands in their range that you can afford to build the pot a lot more vs before the 4th spade comes to slow down your action form Tx etc.

On the turn, again, your bet size is too small. Tx is certainly never folding no matter how close to pot you make this and marginal pairs are likely folding to any size if they don't have a spade.

On the river I agree with your analysis, 8s8x and that that junk is now not calling all that often and there's not all that many combos of these hands anyways. Tx is a sizable part of his range and defo not folding, since he flats so many boradways I think Tx is enough of his range for you to mainly be targeting it for value and I like the slight overbet. If you build the pot a bit more though on previous streets you can really increase your EV for the hand though.