Are you sure you measured your inseam correctly?
https://www.competitivecyclist.com/S...ulatorBike.jsp
Also, I did the heel to pedal thing on my bike and had knee pain, raised it up this weekend to get more straight on the bottom of a stroke, which is enough where I can't touch the pedals with my heels but is more comfortable. I plan to raise my seat even higher because my knees are still a tad too bent.