a) Work on Conclave first, it's easier/WAY less brainfuck especially with your ranged heavy lineup and a rogue for wind plateau.
b) Get used to the "random" factor and work straight on it if you want the kill. It takes some time until everyone gets into the fight and remember all the possible actions ("Oh yeah there was that shield.").
For more overview I'd recommend a two-position-tactic with the trons next to the middle (except Toxitron of course), only swapping back and forth on pinned flamethrowers or those toxic clouds.
Have your dots classes utilise Arcanotron's puddles to the max (while growing it grants +100% damage instead of +50%), everyone should specc into anti blob talents to handle them ASAP (your rogue will have to kick Arcanotron later on, leaving you with less CC/dps on the blobs).