doughboy,
As far as which self, it's kinda subjective, depending on the temp you're shooting for. From mapping the FE, the bottom shelf definitely gets the hottest blast of air as the unit is coming up to temp. If it's stablized the temp, the 4th shelf (the top) is the hottest as air rises. Short answer, run it up to whatever temp you want and put them on shelf 2 or 3.
Good news is CS is offering another Competition Class on the FE this spring. Bad news it's not until May. The class will be taught by Fast Eddy, don't know if Dr. BBQ will be there or not. I think they're finalizing the details, but it's early May.
The key to your solution is timing (isn't it always). If you're like most FE smokers, you brisket/butt will be done about the time your putting the ribs in. There may be some overlap when all three are in there, but it won't be the full time for the ribs.
And with an FE, you need to practice chicken if you're going to try one of the hotter methods in the FE. It can jump the temp up fast for sure something you didn't probably have in the Jed.
Hope that helps some.
Russ