I think it's normal ESP for DE size 35.
my zipper also not straight, in fact it's very wavy. not exactly smooth when I zip it up. I brought it in and when they took out other DE speedy 35, the zipper are all not straight.
my mono is fine though.
I dont think she was talking about the zipper. She's talking about the pull tab..?
And the zipper should lay flat/ straight. It's the basics of a good zipper install.