Honestly, I probably would have thought the same thing about a newer liner needing less attention. It just makes sense in your head that newer equals safer. Reading your post really drives home that the risk is the same no matter the age of the parts. It's a good reminder to trust the advice of the pros who actually see what builds up over time. I'm going to be much more strict about scheduling my own cleanings from now on.

Well, any day works if you make it a habit.

Quad stretches helped me too, like ninaowens said.