Hey,
I haven't been on many tours, just one six-day ride and a lot of commuting, but from what I've read about the weight distribution is that more weight is put up front. I did my ride like that. I was probably close to 70:30 but I think most people say 60 in the front 40 in the back. Of course being as even on both sides as possible.
I like the way the bike felt with more of the weight in the front. I don’t have rear panniers yet, so everything in the back was just strapped down to the rack (that’s why I wasn’t able to get it to 60:40) the steering was very smooth and on long straight stretches of road I didn’t have to make small steering corrections. It just went straight.