I see this is already in the works, but
I usually take notes in a very dimly lit room, and I imagine that a good chunk of your target audience probably does too. I find myself using the lined pdfs a lot more than originally thought. Any chance of making a more college ruled lined pdf (narrower lines) or even releasing a lined notebook/pad? Its tough to see the dots in the dark!
Releasing a college ruled pad could be a quick fix and effective bridge to gage interest.