get rid of the physically based set entirely since the special set is the one that people use for the most part. besides, investing in kyu-b's monstrous atk stat also won't do much good at all as you don't get much out of it. this is how the set should look like:
Wallbreaker
move 1: Ice Beam
move 2: Earth Power
move 3: Fusion Bolt
move 4: Roost / Outrage
ability: Terravolt
item: Life Orb
evs: 20 Atk / 252 SpA / 236 Spd
ivs: 29 HP
nature: Mild / Hasty
evs allow you to outspeed +spe base 80's which include unmega'd gard, gallade and mamoswine. the extra attack evs from using 56 are negligible and don't acquire any 2hkos/ohkos that 20 atk doesn't. having a -def nature over -spdef is actually preferable on kyu-b since most of the hits it is taking are on the special side of the spectrum rather physical by virture of its typing (water,electric,grass,etc.). you can give a mention of rash or naive in case you want to take priority hits better in set details. be sure to incorporate hp fire, iron head and dragon claw in moves section as they are all viable filler options to use on kyu-b.
name: Substitute Attacker
move 1: Substitute
move 2: Ice Beam
move 3: Earth Power
move 4: Fusion Bolt / Roost
ability: Terravolt
item: Leftovers
evs: 56 HP / 216 SpA / 236 Spe
nature: Mild / Modest
this is how the set should look for sub kyu-b. idk why u had roost slashed with epower and gave hp fire a slash too lol. evs give it 101 subs, enough speed for +spe base 80's and rest is dumped in spatk to pwr up ice beam and earth pwr. if using roost, be sure to mention in set details that life orb is also a viable option to run on it since it bluffs a wallbreaker set and can heal off sub and lo recoil.
as for the scarf set, just take off naughty and make it solely naive. outspeeding +1zardx, volc, scarf land-t, etc. is crucial for its role as a revenge killer. a -spdef nature is preferred for this set since scarf kyu-b will be more likely to take priority hits. you can mention a naughty nature in set details, but make sure to say that it should run 252 spe with it since it is required in order to outspeed +1 jolly megagyarados.
in oo, take off flash cannon seeing as iron head is a million times better and incorporate a mention of assault vest. also give draco a mention in oo as it gives kyu-b a very strong neutral coverage to abuse without being locked into the likes of outrage, despite having to switch out afterwards. once you do all this 2/3