No love for the noble Redback or humble Flea?

Cloaky is a rough matchup for spiders on an open map.
Glaive is like the perfect counter against Flea harassment. Cheap and fast.
But don't underestimate Redback. If the enemy makes lots of Reavers to counter your Venoms, you basically have to include some Redbacks to counter the Reavers. Also, if you can get them built near the front with an Engineer commander, it is a pretty good value proposition where you can use it to counter Reavers and run over light porc without losses. Just be careful to not have your Redbacks overrun by Glaives.
Venoms are perfect to prevent your Redbacks from getting overrun though and they can also help fight Ronins by distracting them and potentially even running them down if the opponent isn't careful enough.
Venom is still a kinda expensive and fragile unit so you gotta be careful with how you engage Reavers and Lotus turrets and Ronins. Repairing them can be essential in order to be cost effective.
Also mix in some occasional Fleas to be able to overrun and distract Ronins when the enemies Glaives and Reavers are out of position.