Patch 1.0.5.0 Menacing Mask and Vital Striker not working as intented?

[Britishrobot]

I understand that before the patch, the two were doing more damage than they were supposed to. But now, with a light weapon equipped, I do more damage in combat when I use a helmet other than the Menacing Mask. 

I'm using the Murder's Best Friend, with the Vital Striker and Sleight of Hand perk at 17 Sneak. My stealth multiplier on the weapon is +1,025%. My melee is at 15, telling me that the knife has a damage of 64. The traditonal sneak attack is working perfectly fine, doing around 700 damage on the first kill. But during combat, a swing will rarely if ever do more than 200 damage. Shouldn't a combined 60% of my sneak attack bonus be more in the 300-400 range?

It's quite frustrating that the character I put 50 hours into can now barely kill enemies in combat at level 24 on Normal difficulty.