We seemed to do pretty well on avoiding his spout ability. Our problems seemed to start during his submerge stage. We were not getting all the adds down and under control in time. We started by trying to CC the inner ring, but the mobs on the inner ring ran for healers before we could get them CC'ed. Then we tried CC'ing the outer ring and killing the inner ring. This was better but we still had adds up when Lurker came back up.
I think really our biggest problem was that we were a bit undermanned for healing. We only had 5 healers in the Raid.
Our best attempt was around 70%. I think now that we've sampled SSC and TK, we need to focus on one boss and wipe on him until we kill him.
During SSC I was able to get my Hit Points up to 19.1k but I forgot to screenshot it.