I should have added our rows run N-S and slopes to the north and we pull bales from the south.  I agree that either push them tight or space them out, don't just let them touch.

We use several bales every year to build a windbreak.  Since we have a 5x6 baler I find making 58-60" diameter bales with edge-to-edge wrap works well for the bottom row since we and then set a 68-70" diameter bale on top of it and the end of the bottom bale is completely covered and overhung by the upper bale that is 62" deep and 68-70" in diameter.  When I stack them I leave a gap of 12-18" on the the bottom bales that are on end and that gives a 10-15" gap on the upper bales.  The only portion of the bales that I find wet in the spring with this method is the 4" in contact with the ground of the bottom bale; when we dismantle the remainder of the windbreak I make certain to leave a gap between the bales that were on the bottom so the face can dry out in a couple weeks.  I have found this works a lot better than pushing both layers of the windbreak tight and having the top row seam over the middle of a lower bale and funnel the water into the bale.