What if, in true Japanese style, we made the discs somewhat of a gambling venture?
Let's just suppose that a disc is incredibly powerful yet becomes easier to counter as the PL differential between the disc-user and the defender increases.
This means that when a disc hits you, you might be able to struggle against it (using old or new animation), swat it away, or most likely simply get sliced. At some extreme point I suppose you could block it with Kiai. The point is, this means that whenever a disc comes your way you can choose to attempt evasion or take a gamble and test your strength. In ESF, it pays to be weary of who your opponents are. You could even add a special kill for deflecting a disc back into the user. This would be an interesting way to defeat noobs relying on disc spam, as well as a hat tip to Frieza.