I read once that if at some point someone replaced the hinge foam with foam that was too think it could rag out said hinge.
Hopefully this is not your scenario.

Get the correct foam from J.Goodman and I bet you'll be fine.
Don't sweat the door channel foam too much. It's an easy job, just messy and time consuming.
Use the wooden tool he has for scraping that crud out.

Once you do one they are no biggy really.