Post of my time maiming him was with devourer, but I think the concept is still the same.
I'd personally farm until about 9:30 and only gank when it's heavily needed. Then take the dragon then try to gank when you can. If top lane is doing well, give them rift herald.
When team fight comes around, side push until someone comes and defend. Then run mid through the jungle and spam ping that you're going in. Ult and e before you run in. Dive the ap carry or the ad. Don't q as a gap closer, use it to evade cc skillshots. As soon as you land from q, auto once and w. Take they're initial burst (1 second Max) and start auto attacking again to lower q cooldown. Keep fighting until dead, and focus squishes but don't stop attacking.