Do you have long femurs? While my legs are short (really short), my femurs are relatively long. I have to put my saddle all the way back on the rails and use a seatpost with a lot of setback in order to get my knees far enough behind my bottom bracket to make my quads happy. I prefer to sit a bit farther back than conventional wisdom (knee over pedal spindle) would otherwise indicate. I get a lot more leverage behind the pedal that way.
If you do start playing around with your position, use some tape or permanent marker to indicate where you started from. If you move your saddle back, remember that it will effectively raise your saddle, too, such that you usually have to lower the saddle a tiny smidge to compensate.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher