Assuming that the raid group isn't having any issues taking down the Hideous Amalgamations during the Spine of Deathwing encounter, it is likely beneficial to use double WP due to deadly poison ramp up time as combat rogues.
Here's our kill last Sunday,
WOL. We have 2 combat rogues in the group and only ~30 seconds of DP uptime on all 3 tendons combined. Maybe this statement goes without saying, but I hadn't thought of it until going through the logs.