Flop the nut flush, turn and river pair the board

[Robb]

raise flop
raise turn
raise river

i'm not folding to any 30 bb short stacker with a hand that strong

The only thing we can beat on the river is a pair of 8's, right?

by raising on earlier streets our money will be in before we see the river so it doesn't matter

Again, I totally agree with this. I am just saying that if we get to the river and we aren't all-in yet, and the Villain leads out, at that point we should fold unless we have a good read to the contrary, because Villain's range for that lead out crushes us.

This is almost true - still depends on the exact range we estimate and the amount left to lead.