@orange
um, and how do you improve insulation Piru? by cutting down some wires?
Much of the blur problem originates from the crosstalk of the cable.
I carefully removed the connector on one end of the cable and removed the plastic tube covering the actual cable. I insulated each wire separately by using the insulator from 10BASE2 cable I ripped open. Put back the connector and it's done.
It made 1600x1200x16 mode usable.