[UPDATE]
Since this was just an experiment, I decided to try a cheap seat post from Amazon. Got it yesterday and put it on my K2. I made an initial adjustment, moving the seat as far forward on the post as allowed and checked the fit. I would say it moved my seating position at least 1 full inch further forward, maybe a little more. I know that doesn't sound like a lot, but it put me more over top of the crank rather than behind it. I also noticed I was able to bring my aero bars forward a good cm and still have good position on the bike.

So I took the bike out today. This was a different route than I did on Saturday. Conditions were different too. This was shorter and a bit flatter, however, I also had a lot more wind today than on Saturday, so that's going to corrupt real data. What I can say is my "seat of the bike shorts" impression is I was able to put a lot more power into the bike. Previously, I felt like I was losing leverage because I was behind the crank. Now I feel much more over top of it, so on my power stroke, I'm pushing down and not forward. I have to say, I really like it. And, again, the data is suspect since it was a different route under different conditions, but my pace today was 1.4mph faster than on Saturday. I actually spent a considerable amount of time in the 20+mph range.

Having said that, I think I would still like to be just a bit further forward, like maybe another inch or two. But eventually you get to a point of diminishing returns. At least right now, for this bike, I'm really happy with where it is.