I have an easy brandish fix that should balance them even without decreasing their (crazy high) damage. I think that changing the charge attack so that the explosions turn in a random direction (and angle) from the attacker. So, if I were to use a charge attack, it could veer to the left, right, or travel straight. Each explosion would turn the same amount as the last, and they couldn't turn too sharp. (Maybe up to 20-25 degrees on each explosion.) This would make the Brandishes reliable at close range, but not so much of a sniping weapon.
Note that the explosions would still always push forward, so you can only have enemies travel along the wave of explosion if they travel straight.
This would effect every single brandish like charge, including Proto Sword and other T1 weapons with similar charges. However, when you are working with 1-2 explosions, the effect is so small that you wouldn't really be effected by it. It only is more noticeable when you have more explosions, where the turn effect can stack.
I got this idea from Red Rovers in FSC, believe it or not.
Not a bad suggestion. But then there won't be any skill in using. Like you wouldn't be able to pull of trick shots if you didn't know the direction the wave was going. It will all be a bit random and annoying. I like the brandish line as it is now. It doesn't need a fix because it's not broken.
Maybe something like the spur line. The disks could veer off in all sorts of random directions. But obviously to truly test it we need a 5 star version of it.