CQC is more important for the mainhand component of a nice fist weapon. 5% extra crit on your main hand = 5% more critical sinister strikes which in turn yields more combo points. This could be the cause of your "energy regen" feeling lower. It's most likely CP generation slowing from not having a fist weapon. Given, the sword is a small bit above your fist, I'd look into going combat swords and finding a suitable offhand. Mainhand weapon specialization tends to matter more, especially for combo point generation. If you really have no offhand swords to your disposal, I'd get on some 10man malygos/sarth/naxx runs in hopes to either get a suitable offhand for combat swords or a better mainhand for CQC. Or maybe you'll get lucky and next H-naxx clear you'll nab a Calamaties Grasp and rock out some BiS T7 loot =D