ya bro thats big plant for a 5 gallon bucket, Just transplanted a 5ft from a 7 gallon to and 30 and it was root bound pretty significantly. That might not be the case in your situation BUT if i were you i would transplant that bad boy into a much bigger size pot (for instance 20-30 gallon rootpot) that would give your plant much more space to root out some more which will lead to higher yeilds