TO FIX "GHOSTS" ARE THE ADJUSTMENTS A,B,C USEFUL? THEY APPEAR TO AFFECT THE LIGHTS BRIGHTNESS. HAVE NO USER MANUAL OR ANY BASIC INFO, SO AM PURELY USING OBSERVATION WHILE TWEAKING. ALSO COULD THE SCR'S BE LEAKING IF THE POSITION CONTROL VOLTAGE FROM THE SLIDER CONTROL PANEL IS SUFFICIENT? (APROX...