Mushkin Blackline 7-7-7-20 threshhold?

I'm at 1612mhz right now (8x 206) What have some of you guys taken this stuff to? is 1700+ out of reach?

I'm working with Blackline 996657 sticks right now, and to be honest they dont really like to run much out of their range. I haven't gotten mine stable over 1600, but then again I've been mostly working on lowering my latencies.