give it faster coold down and it will be more effective. It is good it got nerfed in range. But bunker-burst is a joke. 60 range some luck to kill some crew-mebers and then cool-down of doom. Every scot is better in that job.
Scott HE barrage isnt really comparable, but I support barrage ability recharge reductions across the board tbh. No argument there.
I dont think the autoattack cooldown should be reduced though. Brummbar is already an instant retreat for infantry and Id fear overbuffing it against them.