Setback in regards to the bike has a plumb line thru the BB axis, as a zero point .
so a tall post, long way from the crank axis , first off will be quite a ways apart
at the top of the angle .

the Knee over the pedal measurement is, to some extent, dependent on dimensions,
length, of thigh and foot of the rider, plus setback .

Get on the Bike and see how it all sorts out..