Would be awesome if those tools could be separated from the rest to set them independently.
These power tools level too easily.

Also, excluding these tools makes no sense cause sooner or later you farm much less with these tools than with normal stone tools.

Another solution for the problem with the op chainsaw and jackhammer at leveling and having them to exclude cause of that:
Let them excluded from being able to level but let them use the actual level the player has.
This way it won't be a disadvantage to use these tools instead of lower tools like the stone pickaxe and the whole use of tools makes more sense again.