As always, shoot as many bows as you can.... but like others have said, add the Diamond Marquis to the list of considerations!
1. When I shoot 30" feathered CX300's with 100 gr. tips, 30" DL and in the 62 to 65# range, I dial in at 20 yds; put my pin just above the X at 15 yds, just below the X at 25 yds, and that works for me.
2. Fast enough... no problem whatsoever with the above set-up. It's like "release... arrow appears in X", almost like playing a video game.
3. Personally, I think consistency is definitely more you than the bow, when you're looking at upper-end bows. Get a bow that's fun and encouraging to shoot, and you shoot more. Hopefully, the more you shoot (and the more you vary your distance, angle, and elevations from the target), the more you build your consistency.
4. When I do crank my Marquis up to 70#, it honestly pulls and releases just as smoothly as it does down towards 60#. I only shoot it somewhere in that 62 to 65 pound range because it seems to be "our" sweet spot. How "smoothness" is defined is a personal, subjective perspective. To me, it's being able to hold the bow on-target, sighted in, and then draw in one continuous, nearly-constant force motion until I hit the wall and anchor. Big check mark here, with the Marquis.

I'm just saying that I can accomplish your 4 things with my Marquis; there are plenty of other bows out there that can and would meet those same criteria. When I factor in things like looks, feel, durability and price, I'm never sorry about the choice I made.