Check your spider also. It's a good catch and must be remedied.
Machining of the pockets and adding the glide washers is a must. Adding the glide washers and not machining the pockets in time will render the same issue. During loading and unloading the spring must be able to rotate. Locked in the wear groves it is only a matter of time before primary spring fatigue surfaces again.
The primary springs that Polaris offer today, IMO, are the culprit. The tang end of the coils do not lay flat against the last coil. With the cost of a new primary today, we must be more vigilant about maintenance.
One thing to remember, the addition of glide washers without machining will change your spring rates.