I am experiencing large NAND write consumption as well. I have a new intel 530 120 GB ssd with a fresh Windows 8.1 install. After the initial install period with many host writes I immediately noticed that the NAND writes continue to accumulate with little corresponding host writes.
As of now: 90.22 GB host writes and 227 GB NAND writes.
I have observed that I accumulate about 1 GB NAND writes per hour idle when basically the only writes are lastalive0.dat and lastalive1.dat updating at the usual 1 minute interval. If I disable these writes I can achieve several hours without NAND writes incrementing.
Running Photoshop CC with scratch disk on a separate HDD I accumulate 4 GB NAND writes per hour with only 0.25 GB host writes. This is sitting idle with no image open.
Basically, any small amount of host writes triggers a large amount of NAND writes.