Dark Devil and Northern lights blue (day35)

Hey guys these are my babies about day35 from seedling. How do they look and will these buds gain any mass>? they are under 300w+450w LED for 20/4
The one with more hairs and buds and bigger one is the Dark Devil Where as the smaller one is northern light blule... Anyone else with some experience with these? How do they look and how much longer u think?

At least 50+ days i also see nute burn tips what you feeding ease up a little

y my lower leaves on autos getting so yellow even so long before flowers are ripe any nute suggesttions?

Well.. plant shows signs of tip burn look up maxibloom or lucas formula