Suggestions for abused/underused items, including caps and non-linear scalings

Sterak is too effective on carries ( be them melee like Yi or ranged like Kalista or "ranged" like Graves) despite having a shield equal to a % of the HP of the wearer? Easy, make it exponential, aka an amount of max HP multiplied by itself.

Yi, Fiora, Xin and all those can be assassins with just a bruiser build due to high base damages needed to let them snowball as assassins and DPSs? Increase the current ratios, change from base AD to bonus AD where needed, increase rank 1 base damage, do not increase it per rank. Ex: Yi's Wuju Style 10 / 15 / 20 / 25 / 30 10 base true damage, (+ 10 / 12.5 / 15 / 17.5 / 20% AD) (+ 15 / 17.5 / 20 / 22.5 / 25% bonus AD). His Q can stay to total AD scaling, we don't want to delete bruiser Yi, we want to make it not as supereffective anymore.

Thornmail is not effective enough? Add an MR scaling so it's only worth on tanks, but any tank, not only the ones specialized in armor, and make it multiply with the armor scaling.

Iceborn is too strong on Ezreal? Nerf the base slow and slow radius, increase the armor scaling on those and soft-cap said scaling (so that we don't get things like Rammus freezing the width of the Baron pit at 30 minutes, but rather at 45).

Triforce isn't worth on anyone anymore? Make Black Cleaver stack twice with abilities, with smaller stacks overall, so that CDR+ physical damage + autoattack bruisers use Triforce rather than BC, which is left for CDR + physical damage abilities bruisers mainly to use. Take away the base damage from Titanic so that it becomes only for full tanks. Buff Rage passive on Triforce.

Cinderhulk is too weak? Increase its bonus damage to monsters to 200% and slightly nerf the value.

Wit's End: back to 42 MR. Steals on-hit 10 magic resist up to 30 (instead of 5 up to 25) if the wielder is melee.

Deathfire grasp: change effect to a permanent mark giving you a spell damage increase on that target, scaling up over 20 seconds (so it's not for all-ins unlike Thunderlord's). Switches if you target with a spell another champion, is deleted if you autoattack another champion.

Frozen Mallet: slow scales with resistances and HP, reduced by 15% (not 15 percentual points, 15% of the number in the scaling) on ranged champs.

Rageblade: can't stack more than 1 per 0.7 seconds.

g'damnit add some effect to these wards

Giant Slayer: +1% phys. dmg for 50 target's additional health maxing at +10% at 500 +0.7% phys. dmg for 100 target's additional health maxing at +14% at 1000. This becomes actually effective against tanks without being overbearing against the poor Sightstone support and the Rylai's midlaner.

GIVE US A REAL AP+ARMOR ITEM without too much budget in some silly playmaking passive.

Dead man's +50 armor -> +20 armor + 30% bonus armor (soft-capped at 80). Melee only crushing blow -> reduced to 50% damage and slow on ranged champs

Frozen Heart: 700 range radius increases with levels, from 400 to 1100.

Cull: give it the +25% healing from potions that Dark Seal has.

Thoughts?