In general I open pre with 4x ep, 3.5x mp, 3x lp and 2.5x otb + 1 for every limper.

Expanding on d0zer and Chucksos comments about this river, this is a good hand to think about relative hand strength. We've got an overpair to the board which makes us happy but think about what we beat. Srsly, look at the board and figure out what hands we actually beat.

Also don't be so afraid every time a possible flush completes. He's got a range of hands he's playing and only a small part of that range is on a draw.