I propose a change to the Spur line's attacks wherein the "winmillion" particle is present from the Arc Razor. The projectile should behave the same as the Orbitgun's, travelling up slopes, etc as an entity rather than a bullet. Furthermore, while the Arc Razor should get the Winmillion's attack, the Winmillion should gain the Orbitgun's attack, albeit scaled down in damage.
Arc Razor-1 disc | Winmillion-2 discs | 5*-three discs?

As for the bug mentioned, holding Guard right after releasing the Winmillion's charge attack will often cause it to never appear, cutting off the animation before the projectile is emitted.