U should have held ur second wildfire untill ur next reload was up. Since u can't get more than 2 wild fires u want to use reload as it comes up then hold wildfire for ur 3rd reload along with b4b he and hyper charge. But that only applies to a 3 minute parse or on a sss dummy.
Something that will actually help in a real instance would be to move hyper charge between hot shot and lead shot. The damage up buff ur turret gets falls off a good 3 seconds before ur wildfire ends.the physical vul is still applied but if u look at ur turret buffs on ur party list the hyper charge icon falls off early. U want that up as long as possible during ur wildfire since their auto attacks do good damage charged. Also I think it is generally accepted ur better off clipping ur gcd to pop ur potion +hyper charge before lead shot so u get the max number of charged auto attacks from ur turret durING ur wf burst