I've noticed that a zoom like "Composite: US [width 352 nm]" (for long flight planning purposes) is fuzzy on my Nook HD+. Whereas, with brand G, it's fairly sharp at that zoom. (I can post a cropped comparison if requested.)
Ironically, it looks sharper at 705nm zoom.
Of course, if I go to the next zoom in after 352, that's the Sectional, which is nice and sharp.
I suppose I should try this next instead of asking here, but will downloading WAC's improve this situation? I prefer the detail and currency of Sectionals, which is why I don't use WACs.