Well, if there's no new ideas for approaching we should consider the alternative.
If you're dealing with a character that can outcamp you, I suppose the smartest thing would be powershielding. My friend has a superb Ike, and one of his most effective tactics against my Lucario.
He calls it his "Walk of Death", which is a bit annoying, and all it really is is slowly walking toward your enemy while powershielding each projectile. Once you get too close, you will often intimidate your opponent into rolling or jumping. This is very punishable for Lucario, primarily through Dtilt and Fsmash can put the pressure on hard once you get close enough. I think this tactic would work well for Lucario by merit of his long range.
Also note that getting hit by projectiles isn't ALWAYS a bad idea. Here's something I said in another thread.
It works as a mindgame and Lucario is the best character to use it because of his aura. If you're going to die to a strong attack anyways, go for it (providing it's a low damage and knockback projectile).