Yup, another vote for moving the seat back.

A plumb line dangling from your knee should hang 0-3 cm behind the pedal spindle when your pedal is at the 3:00 (or most forward) position.

A tiny bit of movement forward of the seat can be enough to cross *your* knees' happy line. (everyone is different, which is why the plumb line measurement gives you a good bit of wiggle room) My knees like being closer to the 3cm end of the range, someone else's might prefer to be closer to the 0 cm end.