I would first take apart the current headset, clean it up and examine for condition and having all the parts, like the compression ring that centers the slide on upper bearing surface. Some headsets are very sensitive to minute adjustments (like those with tiny ball diameters). Sometimes this compressing ring is left out. Sometimes the steerer is worn or roughened where the CR sits and hinders the proper function of the CR. Sometimes bearings are installed upside down. Sometimes bearing surfaces are so worn that no amount of cleaning and fresh lube will make then work well. And the list goes on.


The answer is in front of you, not us. You need to do more discovery with the actual headset then get back to us if you still have questions. Or take the bike to your LBS... Andy.