[Baintz]

It's been said before, (and I don't want to come off as patronising) but 10NL can be beaten easily without ever bluffing (beyond c-betting). Just valuebet strong with good hands and let the bottom pairs and gutshots pay you off.

Bluffing only works against thinking players who actually conisder your hand, and the majority of 10NL players are only concerned with their own hand. You'll be called here a lot by any flush, any K, hell sometimes any ace.
Once he calls the turn bet on a 4 flush board I don't think he's ever folding river.