Very useful quick guide, I find myself looking at this when I get owned by swarm hosts.
I'd like to contribute a little. I watched a game in proleague - Rain vs Hydra. The moment Rain spots swarm hosts, he instantly gets a warp prism, warp prism speed, DT, and takes his 4th. The key I want to stress here is timing/speed. Warp prism harrass is really ineffective when every Zerg base is covered with spore/spine. You have to react immediately, not decide to "oh I guess I need a warp prism" 5 minutes after taking locust fire.
Definitely agreed man! The MOMENT you see swarm hosts you have to be on HIS side of the map. If he's moving towards your base, you should be moving towards his. I like the idea of using DTs, but in my play i usually open phoenix so spores are already up. Could be gas draining too. But yeah I'll add that to the OP.
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