I would take those things out of there in about 5-7 days. Root mass directly effects the plants ability to take up water and food to convert the energy from the sun in too weed. I believe its way more important then leaf mass. To test this take a plant and cut 90% of the roots off see what happens, I will tell ya so you don't have too, ya screw your self out of a whole bunch of bud. Now a clone of that same plant grown the same way and cut 90% of the leaf mass off. Some do this too the bottom 90% and call it lollipopping. If you do you will get fat dense buds, minus the popcorn fluffy shy't.
A good way too tell if your plant needs too be transplanted is too be keeping track of how much water it needs, if it all of a sudden starts drinking 25% or more water in between feeding/watering cycles, it wants too be moved.