just watched those chu matches, gotta watch his waveshielding in between your spaced tilts got u shieldgrabbed a few times, i never just spam straight tilts on a shield, do a tilt then shorthop backwards and space a fair or just empty short hop backwards and space another tilt. i also like spaced short hop needles to tilt, kinda like falcos laser ftilt
u couldve taken him on corneria, there are better ways to camp the fin, when u are trying to keep them from coming down, you can bair through the fin instead of ledgestalling, you can walljump a bair through the fin and save your doublejump for another bair or reverse needle and grab the fin again.
also when they are already down there you can camp the finvincibility with fastfalled aerials or reverse needles off the fin, and by jumping and upbing right away you can regrab the ledge extremely quick on the way up, maybe ill record some of the stuff im talking about, good matches