I found I wasn't completely satisfied with my thermals after extended sessions, just using the Digi key heat syncs. I managed to lower my temps down to 42-48C while gaming for 1-2 hours at a time by placing some of
these between my CPU/GPU and the heat syncs. You'll need to remove the white adhesive thermal pads and cut the silicone pads to the correct size. I also sanded the black paint off the side of the heat sink that mates with the CPU/GPU by placing it flat on my desk and stroking it against the sand paper, otherwise called "lapping" it.
I've also seen some people use actual thermal grease for computer CPUs, I tried that as well but every time I had to open the Ashida up for troubleshooting I ended up finger painting with it.
EDIT: Also, silly question, but what direction do you have your fan oreintation? Are you blowing in or out of the Ashida?