Hm... dunno if I can agree with this. He'd be pretty broken with the first and third points. 3% more plus higher knockback on Smash attacks is a pretty huge deal... and that's not even accounting to how huge that would be with Monado Smash. In Buster, his Smash attacks would have some godly shield-breaking capabilities...
Back Slash is honestly pretty fast as is, for what it is. It's a very wide attack with decent range, that pushes Shulk with extra momentum. I think it's borderline at non-reactable, right now. Does it need a buff? Well... I'd like less endlag on it, it doesn't need much more offensive power, it just needs to not be such a silly gamble, for being such a difficult gimmick to begin with. But... do you realize with 2.5x damage to shields, it would probably insta-break a shield from the front with Buster? Dunno if that's accurate... but it would make the back hit do so much shield damage in Buster that it's enough to break two shields... it'd probably break another Shulk's shield with Monado Shield.
F-Tilt is kind of bad in endlag, but... it does become a relatively quick KO tilt around 90% with Monado Smash. But it's just endlag, so I dunno... I just don't want Shulks to go spamming Smash F-Tilts safely. Down Air just needs to autocancel earlier, I think, it's normal for D-Airs to be laggy, but Shulk can't even fullhop with his. Back Air is pretty unpunishable as it is now... and I'm sort of fine with less endlag on the Dash attack. I think 25% less endlag is enough, though...