Its up to you and your snake. If it eats and shows no signs of stress you probably have enough in the tank. If it fails to feed you may add some more things to add some more security for the snake.
Ive had fake and real plants in my enclosures and personally like them. Some snakes will destroy them though. My BRB is such a snake. He likes to root around and move everything in his cage.
Your plan to move the hides while adding the new one sounds fine. I would make a change to the half log though. they are not very good for snakes as they have two large holes on each side. A very easy fix for this is to stuff the front and back with dry moss. This will allow the snake to easily pass through the moss and find a nice secluded area within the log behind it. Moss has proven to be a great tool for me in my keeping.
This is what I have used for years and it can be had at both big box pet stores.
https://www.amazon.com/Zoo-Med-Terra...s=zoo+med+moss