Maciej,
I still have the Velbon, and use it occasionally too. It rocks a bit, but not when tightened down, and the action is to my liking and stability is excellent for such a lightweight head. I removed the cork from the QR-plate so there is metal-to-metal interface between the plate and the scope for less vibration.
The other head I have and which is in use currently is the Gitzo 2380. It is much heavier and a bit more stable, and basically does not rock at all. I have a good sample with smooth action around both axes, but some units I have tried are too stiff to my liking. The locking knobs are very good in use, but the friction adjustment is not so easy to adjust properly. Also, the handle is a bit too straight and I have bent mine some (If you try this, be very careful, I take no responsibility for broken handles).
My tripod is an over 20 years old Manfrotto 028, which I have modified with some anti-vibration tweaks on the upper leg segments. I have also removed the crank from the center column to speed up adjustment (necessary when one suddenly notices a raptor high overhead) and to save a bit of weight. At some point I will likely get a carbon-fibre tripod to have something lighter and more compact, but since I am set on maximum rigidity, the available options are not that light and certainly are not cheap. And, since I have been thinking of doing my own tripod tests with a method somewhat similar to Jan Meijerink's, I have thought of getting the carbon tripod only after the tests are completed. Only, I have not gotten around to actually doing them and probably will not for the near future.
Kimmo