Well on the first match, I noticed some bad attack choices
-0:08: You could've done another dair to shine instead of a dsmash
-1:12: Instead of a ledgehopped dair, you should've ledge hopped and do a late bair to finish the job
-1:46: Instead of trying to do the shine, bair, shine combo, I would've tried to do a shine to a shine to a shine since he was near the ceiling
Second match
-0:14: Instead of a down throw to a shine, try doing a downthrow into a dsmash. It would've worked perfectly since he was near the edge.
Other notes: I noticed when you SHFFLed a dair, you dair way too early. Try waiting until the peak of your height to do the dair. If you dair too early, you can still get shield grabbed. Also, try edge guarding with other moves besides dair.