Another thing that I've tried, and is working well (day 3), is forgetting the o-ring under the RM2, and using some teflon tape around the threads (make sure you don't cover the whole threads, just the top half so you still get a good ground), and then screw it down. Snugs nicely, and no leaking.
After I have it all together, I roll the o-ring down over the RM2 to the top of the drip cup to hide the brass (little cosmetic trick someone mentioned in another thread). I use another o-ring between the top and bottom of the RM2 (a la super_x_) to get proper air hole alignment.
Glad you're enjoying your new REO!!!!!