Looking pretty good! It's a shame you got a mutant, as it wont get anywhere near it's potential... however running 3 autos in there can be tight so at least it will give you a bit more room to play with.
I've been growing in a 2x2 for almost 4 years, so the advice i can offer is trying a single plant in a larger pot. Like, minimum 3gal but ideally a 5 or 7 gal. You will find you have a much better buffer for nutrient issues and you shouldn't get those discoloured leaves from your previous grows. My single plant drinks 2 litres per day in a 5 gal and the flowers are very dense without any leaf discoloration. I don't do anything special... water every second day and feed as needed. I like to use Canna Terra which is a peat based soil and gives you better growth rates than straight soil (but not as good as coco).
Good luck, I'm subbed and hoping you nail it!
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