I will admit that I have pretty good eyesight so I rarely zoom in on pdfs, even the ones with tiny font. One thing to think about is that you can adjust the size of your margins in the EE settings. this actually makes the font smaller to fit the screen but you can zoom in and write in the margins and the writing stays in place when you move around. It doesn't help with all of the problems but it is another way to work around the problem until there is a software fix.