When I was in The UK , I started all autos in lightmix, and would give a light feed 0.5ml bio grow for example, at day 14-15 with sexing/transplant. Could be partially pot size related, on the smaller strains it can make a big difference.
I like both though.
We have 2 lights of deep blue c in 11 liter square pots, dates I'll have to check, but a couple of days behind your youngest.
Cheers!