It has more to do with weight distribution than it does with sitting in the "wet chair". There is no one seat that is predictively wetter than any other. But the weight distribution of the vehicle itself will largely dictate who goes backwards down the drop(s). Also, the last time we went, we got far wetter from the shooting fountains/water guns than we did from the ride itself. And there is no way to predict which seat will bear the brunt of that. But if you know it is coming, you might be able to duck or dodge that deluge. But not always.
This! Do NOT skip the Pagani or Majarajah Trails. We spend more time observing bats, gorillas and tigers than we do on the rides some days. To us, these trails are what AK is really all about and we devote a fair amount of time to exploring them to their fullest. You'll hear the occassional: "But we have a zoo back home." So what? Are the tigers at AK any less majestic or captivating simply because you town has a monkey house? Your daughters will love this part of AK, for sure.