First I decided to see if I could gain some more speed at the 6-6-6-24 timings. Sometimes you can, other times you can't. Often when you can, performance doesn't improve and even drops, because the memory is already at the “sweet spot” with the advertised timings. I was able to get the Blade to DDR3-1644 6-6-6-24.
Then I started overclocking. It is a little easier with triple channel memory as you don't have to worry about raising the VDIMM. Overclocking memory is always a tossup because though you will get performance gains from increasing the speed, you decrease performance when you loosen the timings. So unless you are raising memory speed purely for CPU overclocking, you should play around with various overclocks/timings and benchmark your results to find the optimal overclock.
After considerable experimentation, I settled on an overclock of DDR3-1960 8-7-7-30. That's a 22.5% overclock, and very respectable for DDR3 memory. I seldom get more than 12-15%, and when I do I usually have to loosen the timings so much that I get little to no performance gain.