Yes, it is to late to re-pot. Just my opinion on this but once it starts to flower it is best to leave it be.Thanks for the tip @SmokingWings.
I will definitely use bigger pots next time... thanks for pointing it out. Is it too late to re-pot them? I have a Northern Lights plant that is 4 feet tall, in flower, and in the same one gallon pot. It is already at Day 40 since it grew hairs and still doesnt have thick buds.
They were very small when I flipped them (6-8 inches) that I just thought the 1 gal pots would be big enough... Clearly, i under estimated their stretch.
Also, many threads and msgs that autos seem to do best if they are in the same pot all the way through. Kinda makes sense since the auto strains were developed or selectively bred for short growing seasons. Every time the plant is moved to another pot the roots are disturbed and it takes time for recovery.