I just use the opq and plaguebearer only. The opq is 57 w/ asa 200, the plaguebearer is shock with ase 200 splash. When gburst is about to go down, i swap and then shoot the plaguebearer a few times, with head count i get a lot of crits and gburst is right back up. Swap then action skill, repeat. I cant figure out what shield so im using transformers with ase and just fake bursting before real burst. Plus it boosts the plaguebearer. Im using a red fang w/ atlas damage and crit and a pearl. I use stack bot/an aoe snowdrift, and the backburner for bossing. Very clean build and very fun!