I used Smash Ball for true combos on some characters but I haven't checked if they are. Probably not, but with items like Gyro and Bombs, I'm down to see the inclusion.
Look at what I found with some testing
Jump canceled gyro into f-tilt/f-smash/up tilt/airslash/dair/fair/Nair/Bair/Uair
Arts(change mostly the effects of second hit,such as being able to follow up easier and to later percents with speed,have a kill confirm in smash,Buster doing what it normally does,jump making the fair into fair combos and could gimp and shield is just a fast way of moving I guess )
Z-dropped,Bair into gyro,air slash(36%)/jab combo(38%)f-tilt
Z drop gyro in front of Rob,fast fall Bair into his back.A good setup since the time you dropped you gyro to the time the Bair hits it will poke shield if held for the duration of setup.(can work with most arts but Buster is the one I tested with mostly)
Peach turnip z drop catch and hit with Nair,jump cancel throw into buffered dash fair(39%)
Best if you have peach's better turnips like stitch face and you can switch fair with airslash,pivot f-tilt(with speed and probally a few other follow ups.
Peach turnip jump canceled throw into grab,pummel once,back throw into turnip into ?
Jump cancel a throw upward and immediately dash grab peach.Pummel once(for damage and timing) and back throw which should knock peach into the turnip.From there,I don't know what to follow up with because at late percents you sometimes get f-tilt and airslash and at early percents a Nair hitting with the reverse hitbox.
Please note that this works really well in the low to mid percents.At high percent you want to go with something like jump canceled gyro thrown down into a continued dash airslash for a kill confirm(near 75%)