Hi Aaron, thanks for posting the file, that helps a lot.

So from what I can tell it looks like you've got a difference in the projected curve because your surface is kind of flatter than the one from the tutorial, I think the one from the tutorial kind of curves out more.

A projection on to a more curved and rounded type shape will make a different result than a projection on to a flatter type shape.

Here's an area where I kind of noticed the difference:



Your surface there seems to be kind of straighter and flatter than guide curve that you've got at the end there.

Did you possibly do a sweep using only the profile from the opposite side of the surface and not including the profile from the side the arrow is pointing to above to make the sweep result match that end curve?

- Michael