If you're talking about around the base of the plant where the roots begin to expose themselves.. well, tree's do the same thing. As they age, they take hold of the soil and make it their home. When this happens the soil actually begins to shift a small amount and compacts on itself. This will sometimes expose some roots around the base of the plant. You can choose to add more soil. Or you can choose to leave it. It's up to the grower. It's not very appealing to see roots exposed on the top of the soil, so add some more soil.

As for feeding, it seems that you're on a strong feeding routine. You will want to change this as the plant gets into flowering.. as the NPK should change once you start 12/12. Over fed plants are fairly easy to spot to the seasoned grower. So simply look around and research the forums for what an over fed plant looks like. The answers are here...and there's nobody better to have teach you .. than you.


Cheers, Happy growing.
Bob.