Thanks everyone for the advice. This was so much fun and I wish I could have paid closer attention to what was going on below me, I was so focused on getting sharp focus. This was my first time, so I knew there would be a learning curve. Two things I realized instantly, the Mamiya RZ67 would have been a mistake, and I wish I shot faste film.
The gw690 was a great camera to have, ergonomically speaking, though I wish it was an SLR, maybe with my L grip and a prism the RZ would be ideal. While I shot two rolls, and won't know til tomorrow how they turned out, I am really concerned that my shots will look horrible for two reasons. I was shooting between f3.5-5.6 depending on the shadows, and generally at 1/250 but some shots at 1/125 - the balloon was in constant motion but very slow. With this particular camera, I have seen some pretty dark corners on shots like this, not to mention how the focus will look.
I know this camera pretty well so maybe it won't be as bad as i think, but there is always this awful waiting period. The other weird thing is infinite focus. I was shooting the ground a lot, streets and houses from above looked incredible, of all towns we happened to fly over the street I grew up on. To focus on the street it seemed like JUST before absolute infinity was lining up in the viewfinder. Whenever I would focus all the way to infinity, it was a bit off, but I won't know until tomorrow.
in general, this was life changing. I cannot believe what I saw and I cannot wait to try again some day. I find myself in search of a new method to get in the Sky, I love this perspective so much.