Hmm,
The pot on the board doesnt control the Torque, well not directly.
It adjusts the reference voltage that the board compares the eyes to, if the reference voltage is lower, then the processor interprets the eyes as being 'high' more often, so it spins the motor less.
It is there because of tolerances in the eyes, so with a particular set of eyes the pot will do nothing, with another set the pot will make a big difference.
I second that!!!-had probs with my Halo....seemed as if the eyes were working back to front?(it fed when blocked,and stopped with no blockage....then went on/off in quick succession every now and again)....then by mistake I found that if I moved one of the eyes slightly-it worked(but stopped everytime i offered the motor assembley to the shell)...I got over the problem by turning the so called 'pot' clockwise....yahoo!..now all is well!