In terms of a good 51 point Survival DPS spec for Heroics, this spec is what I found on Elitist Jerks. Apparently it has been used to reach just under 4k DPS on Patchwerk in Naxxramas. I am assuming that that had plenty of Volley use, however.
As far as rotation is concerned, from memory Draculea recommended Serpent, ES, Steady, Steady, Steady if you're haste capped. If you're not, I'm not entirely sure; I use a tighter version of the old 1:1.5, and just hug the GCD in terms of the number of Steadies I can put out, but I've never had more than around 1.4k DPS with that rotation.
Trap dancing and keeping Serpent up can maintain Lock and Load pretty much all the time, so Explosive is more or less the only thing I use if using that strategy with 51+ point Surv, but the DPS with that is even lower; on the order of 1.2k.
If I want DPS in Heroics at the moment, I use this spec, and primarily spam Volley. Doing that, I've had just over 2k DPS in the Heroic Culling of Stratholme before, and that is the spec which I primarily recommend before the patch. Post patch however, 51 point Survival will be the way to go, especially considering the Steady Shot nerf.
In terms of Glyphs, I recommend Immolation Trap, Steady Shot, Serpent Sting, and Feign Death in particular. For pets, my cat does fine, but tends to die a lot in Heroics. You might want a Scorpid for the 10% extra Stamina.