I didn't see this in the OP, but in tempest I can do:
starter~hat spin, b12 tornado / EX tornado as a starter. its easy to land the b12 tornado. you could actually use b321 after starter~hatspin, but it would be a just frame.
Meterless:
B12 hat spin, b12 tornado, njp, jk dk, f14: 32% meterless
F23 hat spin, b12 tornado, njp, jk dk f14: 33% meterless
B2 hat spin, b12 tornado, njp, jk dk, f14: 31% meterless
1 bar:
B12 hat spin, b12 ex tornado, b321 tornado, jk dk, 21 38%, F14 ender is 39%
f23 hat spin, b12 ex tornado, b321 tornado, jk dk, 21 39%. F14 ender is 40%
B2 hat spin, b12 ex tornado, njp, jk dk, 21 / f14 38% / 39%