3-betting light and 2NL don't really go together IMO. I've never played at that level but I'm almost positive that weak-tight, ABC poker is the most profitable/least variance style. Making moves (FPS) isn't going to work against these guys.

There's nothing wrong with taking notes at 2NL though. You're probably not going to run into the same players much (unless you're table selecting for feesh) but still, taking [good] notes is an art form and practice makes perfect.