Lack of PAS fluid will feel lumpy for lack of a better word kinda goes through hard and soft patches mid turn, and is a fairly distinctive sound. The resistance should be a lot smoother all the way through the turn now you topped it up. But since all gen 5s have a PAS leek as standard its worth having a bottle with you at all times. Also very handy for when you need to top up you auto gearbox fluid as its the same stuff.
Now go check your tyre presures
note to self must stop using vegetables as power steering componants