Could his "enthusiastic exploring" be stress and an attempt to escape? That's usually the cause of a nose rub. Are your temps and humidity stable since moving them back into the viv?

It's hard to tell the severity of the nose rub from the pic, but both my red eyes had nose rubs when I received them (from trying to escape their shipping cups) and they were minor enough that leaving them alone was the best option. Today is 13 days since I got them and they've healed significantly on their own.