Thanks for the suggestion. I installed
LectureNotes Trial and the user interface looks much better on the reader than the one in Papyrus. Especially in the "performance" mode (that considerably reduces the lag) you can still get to all the options without the need for refreshing the page. Also, unlike in Papyrus, you can use the "<" and ">" physical buttons of the reader for turning notepad pages which is nice.
Do you know if there is a way for changing the eraser so that it removes entire strokes? For example, if I write a word without lifting the pen in other note taking apps I can remove it by just crossing it out with the stylus. Here however, I have to take care of removing every single pixel myself, just as if I was using a real eraser.