I keep the lines also, even when I'm drawing graphs. I think it's just habit from so many years of taking notes on paper. My writing also gets bigger and sloppier if I don't use the lines.

I like to keep my ink color on blue. It stands out when you export the pdfs and look at them in color but it looks basically the same as the black on the e-ink side. I keep my thickness on fine. It allows me to write more in smaller spaces

I just finished my first full semester with the EE and I don't know how I ever lived without it.