Hecarim - Iceborn vs. Triforce

Hey guys I've been going Triforce rush mostly on Hecarim, but recently I've been noticing that even when I get insanely fed, I still can't hard carry late game if my ADC is feeding since once Hecarim uses ult, he is easily kiteable and exclusively melee when he builds the typical build. Its been getting annoying that if bot lane loses it doesn't matter what I do unless mid or top can delete the enemy ADC, since Hec is so easily kiteable.

I was thinking of another build, specifically designed to deal with kiting/slippery champs that Triforce builds seem have trouble chasing down:

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This gives more armor than the previous build, about equally tanky (250 less HP, 65 less armor) but in exchange you get the burst AS/MS from Ghostblade, an AOE permaslow from Iceborn, more base MS, slow resist and more Arpen to shred squishies. Iceborn also helps with mana sustain, so the loss of Frozen Heart isn't so bad.

What I'm thinking with the ghostblade/Iceborn build is that it gives burst damage to kill carries fast, still sufficient tankiness and permaslow/slow resist/burst mobility to avoid being kited. If I'm unable to dive and have to fight the front line, or have to peel, the AOE slow from Iceborn should be superior to the pure damage from Triforce, so I become a better peeler as well.