Hey appreciate it, means a lot! Happy to help

Guardian is viable, but a massive portion on why Sorcery is taken is because of Manaflow Band, which allows for consistent poke in lane. It pairs so well with Summon Aery and Scorch and allows you to poke a TON in lane.

I feel like Guardian takes away from Soraka's power as a lane bully. It almost makes you a reactionary support in the sense that you wait for the enemy to jump you and then save Guardian. By that point I think it's just better to play something like Janna instead, you know?

What happens if guardian accidentally procs on some meaningless ability? It's now on a massive cool-down and can basically only be used once per fight.

Also, with Ultimate Hunter, you're not spamming your ult every single time it's up right? It's best to use Wish on multiple low-health targets to get that additional heal.

Regardless, the build you're suggesting is still pretty viable. I just highly prefer to be aggressive in lane and pressure the enemy into making mistakes instead of waiting for them to engage and reacting accordingly, which in that case, I'd rather just play Janna or someone with more defensive capability.

Hey,

You definitely can if you're consistently landing Q's in lane, E however is really simple and easy to hit in lane, providing consistently free poke combed with aery and scorch.

Not to mention, Soraka's E is one of the strongest non-ultimate abilities in the game, providing decent damage, an instant silence, and an extended root as you rank it up. So lowering this cooldown and utilizing it as much as possible works really well in skirmishes and team fights, while q just kinda pokes in lane and gives minor speed/heal.

It's really up to you however and whatever you prefer in your playstyle, I would say both work well!

Cheers :D