You would expect the hindmilk's thickest components to only be a thin layer. Hindmilk is made up of proteins and all the other clever stuff. Pure fat is only a teeny bit.
Here is a photo of what is 'normal' (scroll down, the photo with the single bottle at the top is colostrum).
http://www.mother-2-mother.com/motherconcerns.htmDo not worry. Your milk will vary enormously and your description sounds fine anyway. Lily sounds like she's doing great.
Keep up the good work! (that's your boobs I'm talking to)
I just re-read your post and focused on your yield!!!!!

Good heavens!
Well done ladies (still talking to your boobs).