You are only 3 months into your journey, you have a way to go still. Those sections will slowly shrink, do looping and all sorts of shapes, when this happens, the dreads get fatter, turning into maturity. When mature, you will have about 1 inch of undreaded hair at the roots. They need to be loose or it will cause stress and pull out hairs, so don't worry about the looseness. Don't let anyone try and tell you that they need to be tightened, that is damaging to dreads. They are thinner at the roots right now because the hair is undreaded up there. Everything is going fine for you, no worries....You can just enjoy the ride.....Peace