Great games! I'll give you some advice, if you don't mind it.
With Shulk, try to use SH Nairs more. He has almost no landing lag at all from that aerial as opposed to his Fair. Also, use counter less. It's super laggy if you use it at the wrong time, so it's best just avoided 80% of the time.
In general, try to approach with FH aerials just a bit less. It's not bad, but it is if you always roll dodge away after missing, which I was really able to punish you for. Just try to roll less in general. A character has fine movement on their own, even without rolls. But don't worry too much; it's a habit everyone starts with (including myself, which I still have the occasional problem with)!
You definitely have the potential to get better. Until next time!