Xtyger the B25h has at least 3 x the effective range of a wirble.
Secret is going to be shooting several rounds at it from 4k out, by the time you reach 1.5 or 2k you need to be breaking off.
Also helps if someone else can attack from the other side, he can't shoot at both of you at once.
While the Wirble can shoot out past 1600 yards, 20mm's have so much drop at that range that the odds of hitting you are slim.
Now get inside of 1k on one, and yes they will ruin your day for sure.
So the answer is not to change the perk on the wirble, its to adapt tactics that will work without dieing.