I don't know people are TRYING to weave 2x between heat blast. It's on a 1.5 second GCD and you get three charges of gauss round and ricochet; since WF isn't affected by oGCD abilities I see literally no reason to double-weave them during a 1.5 GCD burst window. The ping issue arises from the fact that both wildfire and hypercharge carry animation locks, have desynced durations, yet are entirely co-dependent and have fairly tight windows. The other issue with increasing WF duration and capping the damage is that it makes it far too easy for low ping players to comfortably do anything they want in that window, making it super easy.

The best solution imo would be to have WF auto-trigger hypercharge if it's available since they're CLEARLY designed to go together, and further reduce (or eliminate entirely) the animation lock associated with it so you don't have that awkward delay.