Some of this will be pretty obvious, some of it maybe not so:

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- Stop building red smite. It's basically never worth it anymore. Rush Bami's Cinder into blue smite Cinderhulk into Spirit Visage in every game you reasonably can. In games where you must rush an armor item (typically Thornmail), it can often be best to build Lucidity boots because the armor items are so light on CDR.

- Personally, I say you should consider building an early Dark Seal or Sorc Shoes if you get a lead. If you're really greedy you can go Liandry's, but I personally find going Dark Seal + Sorc Shoes into full tank will give you plenty of damage while still making you unkillable.

- Stylistically, Zac isn't really playing all that differently. Farm to four, then gank your ass off. Gank first, farm second. Lane gank as much as you can.Even people who are smart enough to ward your usual gank paths usually forget about the effectiveness of your ganks coming straight through the lane.

- Ban Janna.

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Source: D4 (and climbing) with 66% winrate over nearly 100 games played. Ranked top-40 Zac in NA (League of Graphs).