If he made the adjustment static (meaning you weren't pedaling its much easier for you to "cheat" and drive your heel down) he should be observing what you look like while you pedal at a normal cadence.
for reference I took a quick video of myself a minute ago, I was curious as to my own fit. I could certainly be lower/longer in the front .... I went into a local Tri coach for a fit last year and he said not to move a thing. So this is where I am for reference.
This was at 92 cadence. My form is not perfect by any means and my fit is certainly a mix of comfort and speed. Notice my heel is pretty low. And my knee angle is 142 or so...
I use a program call Pickpic to capture the angles, it has protractor feature. Its free. I highly recommend downloading it and fooling around with your fit. Then YOU have the numbers and can figure out where you are at.
For you I recommend practice pedaling form. I think you will need to focus on getting that heel down. If you just can't and it causes pain then there is a sacrifice to be made for comfort and injury.
Yes I know my grill sucks. Yes I know the porch needs paint. :)
"4 wheels move the body, 2 wheels move the soul"