Good setup.
Since you are open to all and every comment or suggestions, I can come up with some.

First raise the humidity some how. I'm not familiar with clones but 20-25% is low for normal vegging and must be harder for the young clones i think.
You can start with removing those unused big soil bags. They'll suck up humidity instead of plants. Best way is a humidifier but, if you're out of budget, you can use wide water tray/s filled with water. Wet towel, or some other things can be used as well.

600hps not needed at the moment IMO. Lights distance looking high. You can keep it closer. Still, I am not familiar with HPS but looked too much and high to me. (Using only 150W now also helps raising humidity)

Your medium have everything in it and looks strong/dangerous for young plants. You must be careful in the beginning (Whenever I see "allmix", "fullmix", "supermix" or similar, i think like this).

Looks like you don't need to feed for a long time. Maybe clones need some rotting nutrients? I don't know. And again i don't know how suitable is this medium. Maybe you can attach labels photo/info instead of brand

Are you planning to veg just a week? Say month.

By the way, i am not an advanced grower either. Consider this.

Good luck :thumbsup: