Start from the beginning. Put the cog on the hub. Finger tighten it to the hub flange. Put the chain on the cog and chain ring( just like you were going for a ride). SLOWLY (you do not want to suddenly jam the cog into the hub) apply forward torque on the cranks and tighten the cog on (use your cranks as a whip). When it gets tight then put all of your force on the cranks to really get it on.

Next, put the lockring on and tighten. With a Surly hub and Dura ace cog I would put grease not locktite on the ring and cog. Hand tighten the ring, then get out your spanner and really tighten it up.

This seems to work for me.