Thanks for the help so far Michael. Unfortunately I wont get to implement this until Monday, but I've decided to move the Calibration data in the Scratchpad area, and I moved my saved positions to a single 512 byte page. The c8051f02x chips have a write lifetime of 100k writes, so hypothetically this will grant me about 84 million writes. Plenty.

I was having a little trouble writing in to the non-"scratchpad" area, perhaps I need to unlock the page first.