Unusual mouse polling behavior

[zeronullity]

I have a Logitech g9x mouse with a polling rate set to 1000hz in kernel.
Using evhz in a terminal in KDE it shows a steady 500hz... almost never hitting 1000hz, averaging about 450-500hz.
However in a standard VGA terminal out of xorg it shows 1000hz & 500hz polling rates... averaging around ~600hz
[but won't stay at a steady 1000hz for some reason].
Any ideas on this behavior... perhaps a kernel/xorg setting causing issue?