I have the same thing. Also is there a reason why i lunge at an enemy with commando and a tac knife yet the enemy with just commando can always kill me?

I have never won a head on knife fight with a tactical knifer even when I switch to the I can use comando too class, I never unlocked the tactical kife though.  Unless they didn't see me or I came from behind them I never won the fight. So unless they just nerfed it  I don't think anything has changed. I have noticed I have been missing some easy knifing though but I thought it was just lag.

The only thing I find lame about commando is that when they lunge they're invincible to bullets.

Yes! I was wondering this as well. I did terrible when I used a t-knife on my magnums. Guess I'll just akimbo them from now on

it seems like when i use that combination i never lunge 15 feet to the enemy like i do with no tact knife....

That's the part that doesn't work right:  YOU SHOULDN'T BE *ABLE* to lunge 15ft to the enemy.

Commando & tact knife works fine.

In fact, the other setup works fine now, too... they changed it in the last update.  Check the update thread.