Sorry, I am notorious for thinking other can read my thoughts. Oops.
What i mean, is that by installing the nylon bush, any bobbing from the suspension is eliminated, so if there is still any bobbing left over, then that must be due to the seat post. I followed a process of elimination.
That's logical enough. Was it more or less total pedal bob with the nylon bush, or was it pretty much the same? I was hoping that it would raise the natural frequency of the system enough that you'd be in the clear. Obviously, that wasn't the case.