Diablo III - World Record MP10 Ghom kill 6.95s - Fire bats
For the record, the Ghom kills are able to pre-charge Cloud of Bats. Azmodan kills are not. That's easily a ~3s difference in kill speed. It's also probably why most classes won't touch a WD on Ghom - being able to juke the ramp-up part of the spell is a massive DPS increase.
The OP may not have the record (or he may). But let's not compare different bosses with different mechanics that are killed in different ways. There is very little relevance between Ghom and Azmodan because they are different.
If you want to disprove his Azmodan record do it with another Azmodan kill that's faster. Why? Because Azmodan has the exact same mechanics as Azmodan.
Also, if you have a 10s Azmodan kill on your barb, why not just post it and end the discussion? Why the arguing? Either you have proof that there are faster kills or you don't. Why spend so much time talking about Ghom and dancing around the one thing that could really put an end to the dicsussion?