I've always considered myself as a good elemental shaman, have been playing it for over 5 years now with multiple rankings at wol.
Most of the time I was in the top 5 dps at least in our 25m raid (9/13hc atm). You can find my armory below.
Since the start of mop until now, elemental burst used to be one of the best in the whole raid, but thats not true anymore (at least for me). I've noticed it even more yesterday when we were working on durumu hc. And Im not even talking about our enhancement, who bursts >600k repeatedly.
My max burst is around 450k dps, but after ascendance my dps falls heavily and after two minutes or so Im only at around 220k dps, while others still hover at ~250-260 and I fall to #10 in our dps meter (until the ice walls come, but thats another point).
Here is the log for your tries yesterday:
http://www.worldoflogs.com/reports/rt-18mq71hc0e2snpde/
TL;DR: I feel like ele shamans are lacking at single target and it's getting worse the more gear we all get, since other classes seem to be scaling much more efficiently.