Yeah the jumping is buggy with the beams, just don't jump. I noted that in the video for that reason, I REALLY wish it wouldn't happen.
Here is a chart of how you would position, making a few assumptions that I don't have time to test, but I've made charts for two eventualities:
The basic layout of the boss' room is here:
An add spawns on each of the outer 12 circles potentially, their order is random but 12 adds is all he will ever spawn.
So, I've never had to test this, but I THEORIZE that if you stand directly in the center of one of the middle circles, near where I'm standing in our video for most of it, you can absorb three beams. If this is the case, your layout would look like this, with stars representing players:
You have a fifth floater and you never have to kill an add. I'm not positive if this works, but I do know you can be inside the circle and soak two, so unless dead center is just BARELY out of range of both the side beams, it should get all three.
Edit: This image is slightly off, the boss is a lot smaller than this makes him look. You should be directly in line with the corner beam, but basically humping the boss. Make a diamond/square around him and you also should be able to avoid blasting each other with Bloat.
HOWEVER, if that is not possible, I am absolutely positive that you can soak any two adjascent beams. You would then, make a layout like this, with the purple star representing a pet (which is easy to position since they need to be exactly opposite the tank):
FINALLY, if you don't have a pet or have issues getting the pet on the beam, 12 adds is an absurd amount and at that point you're definitely taking way too long on this boss :) Worst case scenario, with no pets and inability to triple soak (since I haven't tested that), youwould use this 6 soak strat and simply leave a hole where no adds spawn for as long as possible. It will still allow you to go through five sets of double spawn adds (he spawns in pairs on challenge mode) before you're overwhelmed with the sixth set, PLENTY of time.
Edited by Marza on 10/23/2012 11:29 PM PDT