Although the triple's gear pump does not have the wildly varying pressure of a Triumph twin plunger, the pressure is still not constant. As each gear tooth pushes out the oil there is a pulse in the pressure which, when the pressure is above the OPRV setting, causes the piston to oscillate, besides the condition when the valve starts to open the release in pressure lets the valve close. You sometimes get this condition in your water faucet when slowly changing from closed to open or vice versa. This oscillation might be the cause of the piston galling (or is it Gauling?).