I am having a hard time getting 2 guys WR the playing time I said I would. does anyone know if as long as I am close am I good or is it best to be over on the playing time. like if I said he would get 40% and he is getting 31 or 38 is that good?
or should I just play him a lot to be safe.

All so if his WE goes down will it come back once he gets his playing time and how fast will it come back?

You will need to be at the promised time. Being under and close wont work. If it does go down if the promise is kept for remaining games he will regain some of what is lost but not all.