Counters

[Upper.Case]

I'm not saying don't never get zerg speed... but if you actually intend on practically using any 1 unit... You better get their respectable upgrades... i.e. zerg speed, hydra range, roach speed/burrow (claws are not always required)... u get the point

i'm still trying to figure out how to use hydra/ultra against toss

Would you absolutly need Ultras?

I mean, if you get that far away in a game with a toss, I don't think there is any unit that will gamebreak you a win unless you have infestors.

I saw multiples replays where zerg "tried" to manage a win on a long term game (which you should stay away from) mind-controlling Colossus.

If I was you, I'd go Hydra/Mutas (speed+range) with infestors, but my long-term game plan sucks right now, I tried never go on long-term and never really tested it on many games.
Instead I try denying expansions (your overlords do magic if well placed)
and expending myself if I can, controlling the game until he's out of ressources..