For starters I would return the Bestva 1500 watt lights if that is an option.
With the HLG550 Ecos, you started out really well. Like going from a stripped down high performance race car (Eco)to an old hooptie (Bestva) that you're not even sure will make it off the starting line.
If you're looking for higher color temperature boards, these will work very well for your veg space:
High Efficiency LED Light Engines. 132pcs Lumileds 2835HE
horticulturelightinggroup.com
V1 are made with Lumiled Luxeon 2835 HE diodes.
High Efficiency LED Light Engines. 132pcs Samsung LM301H LED per board
horticulturelightinggroup.com
V2 are made with Samsung LM301H diodes.
If you would rather have 3500k, those are in stock for both models as well. You will just need a driver, power cord, connectors, wire, a way to frame the boards if you desire, and a way to hang them. Not too difficult, if you have the time. Otherwise there Are other superior options to the Bestva lights you bought.