Although the clear Tamiya orings are leak free, they cause a lot of drag on the shafts, especially initial sticktion.
Personally I have switched all my Tamiya dampers to using the Yokomo blue orings YS7-HG. They maintain smoothness while allowing only minimal leakage compared to the others I've tried. They're a bit larger than the TRF blue, and are softer than the clears.