Well both bows I was going to suggest are not 80% let off[:' (]

I was going to suggest either the Bowtech Black Knight or the Patriot Dually.

The ExVFT would Be a good choice as it has 80% let off, smooth to draw and fast not as fast as the above two but the fastest single that Bowtech put out.

As too the speed you would get I dont know maybe if Kevin reads this thread he will fling some arrows through the crono at your specs