10/20 Flush on turn 300BB Deep

[maggie33]

Game wound down from 9 handed to 3 handed; playing 3-handed for only a few orbits. Effective stacks ~$6000

Hero raises to $80 on the button with 67 spades
SB calls, BB calls

Flop ($240) Js 4s 5c
SB checks, BB bets $160, Hero raises to $400 total
SB folds, BB calls

Turn ($1040) 8h (Js 4s 5c)
BB checks, Hero bets $740, BB almost times out and calls

River ($2520) 2s (8h Js 4s 5c)
BB checks, Hero bets $1500, BB shoves for ~$3300 more

Hero's play?