I would not worry unless the plants look effected by it. Everything sounds good. Are they still mostly white like normal ? If you do loosen then you will damage some. However, on one of my grows Zandor had me cut the roots on one plant of six back to just two inches hanging in the water. It may of slowed the growth by 3 to 5 days. Yield was still as good on that plant, just a little behind. I did it just to show you could cut off root rot and not badly effect the plant.