How do you kill tanks?

So I enjoy playing Quinn, normally dont have too many issues. I get a lane earlier, just playing some normals for fun, and I'm vs a shen. Now, he goes sunfire first item. I've taken armour pen runes to begin with, and I go black cleaver first, botrk second, lord dominiks 3rd. The shen ends up fed as a result of tp/ults, but I still barely damage him at all. What else can I do if I have 3 anti-tank type items but I'm still dealing next to no damage to him? Idk maybe im overreacting, but I feel like anti-tank items arent that effective right now. Tips/Advice?

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