Roots & Potting Question (Just one)

I have seen most people post in threads that for flower they use 5 gal pots to finish, well I just transplanted 4 females from 3 gallon pots just 1 week ago and I removed the tray bottoms of the pots today and it's sporadic but it's like every other hole has at least 1-2 roots *starting* to grow out of the holes, they are about the length of a half inch (if that) outside of the hole.

Already only after 1 week it seems like it's outgrowing the 5 gal pot, is this normal or will I end up having to transplant again?

I've been using hygrozyme too so I know this has helped stimulate the root growth but I've used it only once for watering since it has been in flower.

They usually say once that happen (the roots peaking) its time to transport....seems like you didnt put them in a big enough pot and its up to you what size you want to put them into. The bigger the pot the bigger the grow of your plant.........also the added ingredient probably did help some......