FF better out of your SHs
You're taking too long to kill. Every one of your shffld nairs between 25% and 80% should connect into another nair or an jc'd usmash. anything after that should stop being a nair, and start being a drillshine>usmash.
Work on your retreating rshl. It's faster than the wavedash shl.
Don't shield Float canceled aerails. That said, don't get hit by them either. If you see one coming, dash away, dash dance toward, and either shffl a nair/ dair (% dependant, and their action dependant)
Your drillshine infinite = hella too slow. PM me if you want tips/ help w/ shine comboing.
Contrary to popular belief, DL64 is a FOX stage against peach. Laser the frikin hell outta her, and run away whilst doing it.
btw, that peach did a horrible job of edgeguarding you, while you did an extremely good job of edgeguarding you. Work on your recoveries, you don't have to aim for a circle of radius 2 ft centered at the edge.
Hope this helps, good luck!