Sexing The Babies: The Hardest Part So Far

[hotelvoodoo]

So, BP, our first clutch is about a week out of the egg now, and all of the babies have shed out and have been moved to their new tubs. So we decided we should try our hand at sexing them. My fiancee is a great popper, but for some reason, just can't manage to get it down with these guys. We also ordered a probe kit, for a more "definite" id, but that just gave us more questions than answers. First I probed them on my own and determined 3 females, 2 males. I told my fiancee we should pop them again and he should try probing them just to be sure. He had the same issues popping, and when we probed the second time, they all probed to about the same depth, which didn't really help things. I even probed a couple of my older snakes to get a feel for it and still no dice.
I've watched all the videos and read all the techniques, I just don't get it. Are they really all one sex, or is something not going right?

More importantly, anyone in the Philadelphia/West Chester area that could maybe help us with this problem in person?