It is not possible to effectively analyze the major factors that may result in lower than expected DPS through a Recount screen shot, specifically rotation, latency, and buffs. However here are several steps to help improve your performance in raids.
1. Even for a veteran Paladin, a rotation assist mod (once properly configured) such as
CLCRet can result in more consistent and even higher DPS.
2. High latency will result in lower than expected DPS. Make sure nothing is running in the background while you're raiding. I would also recommend
Leatrix Latency Fix.
3. You are an Engineer, but you are not taking advantage of the profession perks. Use Hyperspeed Accelerators, Nitro Boots, and Flexweave Underlay! These all provide a DPS boost over your current enchants.
4. The STR version of Darkmoon Greatness is a huge DPS upgrade for Retribution. Start saving up.
5. You are 154 hit rating over the melee hit cap, and slightly over the expertise cap. Look for upgrades that do not have hit or expertise.