A suggestion to improve towers

Hello, second post here. I like the tower system and the tablet system of upgrading surrounding maps, but theres no real incentive to use high tier maps in towers. Right now im just using low tier maps to unlock them to use the tablets on them. There needs to be more of an incentive to use higher tier maps in towers. Maybe if you use a high tier map in a tower it upgrades the surrounding maps with a chance to drop the same tier map you used in the tower. I feel like that would be a good incentive.