The difference between nickel and KOReader can probably be attributed to nickel's aggressive standby behavior, which we kinda knew made a difference on sunxi, given the experience on PocketBook. (I'm intermittently working on playing with a similar feature in KOReader, but it's finicky and I hate the performance cost it has, so it won't be ready for a while, and will be opt-in, not opt-out).
Note taking fires up 3 of the CPU cores, and the driver's iffy behavior ensures one of those is pegged at 100% when drawing, which certainly explains the extra draw there.
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