Hello,
I found this thread because I was having the same trouble of parking/unparking cycle with my rig under RST 13.2.4.1000
It was quite frustrating as sometimes my computer wouldn't power off , my HDD would make a clicking sound again and again, I had to force a manual power off
So today I have installed the 12.9 drivers and switched my HDD location in motherboard,
I checked APM value in Crystaldiskinfo, it is Off, and device manager degraded storage controler to intel v12.9, should be fine,
I give you my hardware spec, hope it helps your investigation:
mb: msi z68ma-ed55
hdd: Samsung Spinpoint F1 HD502IJ
SSD for cache: Verbatim Black edition 128Gb
Win 8.1 Pro 64b