2k2-1k:
In my experience (track specific) the GSXR1000 steering damper has far too much resistance, the key with any damper is it's ability to control and limit (i.e. dampen), rather than eliminate. In my case, I actually wanted to lessen the dampening affects, rather than change the factory fluid; I chose an Ohlins replacement that is configured at or near one of it’s lowest settings.
If you have not experienced excessive headshake, then clearly the factory damper is performing as expected, the check ball system will inhibit/limit dampening at low-to-moderate speed, then restrict flow only when sudden-to-violate thrust movements are detected (i.e. headshake)
If your experiencing brief moments of bar agitation as the wheel returns in contact with the pavement; the check ball will then initiate the process of increased dampening; you may experience minor shake during this process; which is completely normal. That said, when I am racing (or riding aggressively), headshake is entirely predictable, the usage of the damper is purely to contain, rather than eliminate; not to mention excessive shake is potentially due to improper geometry/suspension setup and/or implementation of technique.
As I’m sure you are aware, excessive dampening is certainly not ideal, not only due to the decreased rate of initial turn-in, but the fact that thrusting motions encountered when headshake is initiated can and will transfer throughout the entire chassis if excessive resistance is present.
Food for thought.
Thanks!