Im 5'7 170 and I have the seat in my Agent just a notch back from the front. I moved to it from a Vision, then a Crazy 88. I haven't paddled an all star in a couple of years so I can't really compare...but I have paddled several other designs and for my mediocre playboating style and river running I really like the Agent. It's easy to spin, I hit my first loop in it, and it has really good secondary stability for my style or paddling.

If I'm not mistaken the Agent and the Project share many different attributes and I've heard they're basically the same boat.

If you like the Kingpin try it. Mine leaks some but no more than any other boat I've done a 2 hr. play session in. It is dryer than the Crazy 88...not as dry as the Vision.  

I'm guessing the Agent isn't quite as loose as the all star, Biscuit, or Bliss Stick boats...but it is plenty loose for me while not giving up any forgiveness.

Good luck.