I flew EK JFK-DUB-COK in Y in 2006 (and will be flying the same route next month) and I thought it was fine. If you are flying the 777-300ER pick either 47B or 47J. Only two seats in at the ends in that row. You will probably have to wait a while for service to get to you, but it is a small price to pay for the fact that there is only one person next to you. (One thing to keep in mind is that on your way into LAX, you may want to sit right up in front, since that gives you a head start with standing in the immigration line. On the way back, do the same for the DXB-BLR flight).
Seat comfort was alright I believe and so was the service (my memory is fuzzy but I think that's a good thing because nothing went horribly wrong or I would have remembered). The entertainment system kept me, well, entertained, so I was fine.

Load-wise, my experience has been that flying out on Sunday mornings is bad because you get to the US on a Sunday evening and so people tend to travel on that day. My best guess is that when leaving the US, try not to fly out on Friday since that's when the loads are high (unless you want to get bumped and get a free ticket)

Hope this helps!