One thing you can do right off the bat is set the memory timings, command rate (if an option), and the voltage manually.
Another thing is, and I'm presuming here, you can just crank up the multiplier and bus speeds and expect instant stability. You have to do it in incremental steps. Overclocking is a time consuming process and you're going to be doing this for hours (and i do mean hours). If you did work your way to where you're aiming now, what was the last stable frequency/voltage? In any case, 1.35v is a little low for 3.6 or 3.8.