As soon as I hit 50, I respecced my locks all 41 demonology and never looked back. It sucked having no instant corruption for 5 levels but I had zero issues with aggro or problems clearing strat and scholo at 59. Never tried BRD as I hate how long it takes to do that instance.

I also ran Hellfire Ramparts at 62 with 3 felguards and a fel hunter. I lost one felguard on the first boss and that was it until I got to Nazan, where I wiped fast. Not saying you're wrong but my experience in there was that it took a lot more than 3 shots from instance trash to kill a felguard.

As soon as the servers are up, l0de, I'll check the armor/health stats on my FG vs a VW and let you know what they are.