Seawied, I'm rather disappointed that you would immediately choose to use a weapon which several people think is op, then you offer to run the numbers with another weapon that people think is broken, the bec. Both of these weapons being the highest damage of their class against mid to high armored foes. You first use blunt damage, then you use pierce damage. Most 2hers that are used are cut damage, same with poleaxes. How about you run the numbers with one of the highest tier, most popular weapons. Your damage won't be anywhere near as high.
Throwing in a damn
50% speed bonus isn't just a bit ridiculous, it's completely bullshit. You will
never have a 50% speed bonus as melee, ever. Just go into single player, go to the arena and run directly towards your foe who is likely running directly toward you. If you can get higher than a 30% speed bonus I want a screen shot. You'll probably get a 10% and under most of the time. I'll concede the point if you're only stating what is "possible" not what will happen the vast majority of the time in reality. We might as well bring up the fact that 1handers can one-shot people as well if we're talking about what is "possible".
With your build and the highest damaging 2her swung with 8 power swing and zero speed bonus, you have a damage range of 45 to 63. Nowhere in here does it allow someone to conclude "frequently one shot". Throw some cut damage in there and you get "never", even with a reasonable 10% speed bonus. Don't tweak numbers so they're in your favor, you're too intelligent to be pulling bullshit like this.
Pretty sure you can't chamber a CT overhead...
You can, one of two things will happen. You successfully block their attack and get your own off(this is rare as hell) or they crush your chamber as if it were a block, which is what they're talking about.