Hey
Having hot soil is definitely a concern if you're using one with high nutrients, but it usually settles out with time.
My only other question would be...you're running a 2000 watt light at 20 inches!? On babies?! Are you crazy! Move that sucker up another 8-10 inches.😁
Oh i also personally think all living things benefit from rest...so if you are running high power, maybe go down to a 20/4 or 18/6
*if your new growth keeps coming in green and staying green you're ok, those 2 single finger leaves usually die off with time.