Good lord those purples are amazing !
Lower night time temperatures are typically what can coax out the Anthocyanins in the plant as well as genetic disposition
What a great plant it’s turning out to be !
The fungus gnats are annoying but neem oil will make them lazy and dumb and stop reproducing so it should take care of them.
Sticky traps for flies can do wonders as well, look into those to trap the suckers. You can attach them with magnets inside the Grobo if needed.