Scratch ideas to make Trundle more balanced

P - King's Tribute
Every 18/15/12/9/6 seconds, Trundle empowers his next basic attack to heal him for 10% of the target's maximum health (maximum 200). Non-empowered basic attacks reduce the cooldown of this ability by 1 second. Empowered basic attacks cannot be expended against wards or structures. This ability upgrades at level 1/5/9/13/17.

W - Frozen Domain
Cooldown : 13
Mana cost : 60
Cast range : 900
AoE: 1000
Trundle coats the target area in ice for 8 seconds. While inside, he gains 20/25/30/35/40% Movement Speed and Attack Speed, 20% increased healing from all sources and ignores unit collision.

R - Subjugate
Cooldown : 110/90/70
Mana cost : 100
Cast range : 700
Trundle drains the life force out of the target enemy champion, stealing 15/25/35% (+ 2% per 100 AP) maximum health in magic damage and 40% of their armor and magic resistance. Half of the stealing is applied instantly, half is distributed over the next 4 seconds. The debuff remains for 4 more seconds. Against the debuffed champion, Chomp stuns for 0.25 second and extends the debuff by 1 second.

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P - Boneshiver's True Ice
Trundle's basic attacks deal 1/2/3% (at levels 1/7/13) of the target's maximum health in true damage and heal for the same amount. Maximum damage 75 vs monsters, healing uncapped.

Q - Chomp
Cooldown : 6/5.5/5/4.5/4
Mana cost : 25
Trundle's next basic attack gains 50 range, deals 20/50/80/110/140 (+ 0/5/10/15/20% AD) bonus physical damage, slows by 75% for 0.25 second and if used against an enemy champion or a monster, enrages Trundle for 8 seconds.
While enraged, against champions, Chomp steals 10/15/20/25/30 base AD for 4 seconds and stuns for 0.25 second.

R - Subjugate
Cooldown : 110/90/70
Mana cost : 100
Cast range : 600
Tether range : 700
Trundle drains the life force from an enemy champion, stealing an initial 10/15/20% (+ 2% per 100 AP) of their maximum health in magic damage and 20% of their armor and magic resistance for 8 seconds. During this time, Chomp's base CD is reduced to 3, using Chomp against the marked enemy steals an additional 2.5/5/7.5% (+ 0.5% per 100 AP) of their maximum health in magic damage and 5% of their armor and magic resistance and extends the duration by 1 second. The effect ends after 8 seconds (+ 1 second per Chomp) or when Trundle leaves the tether range.