edder's right.......your cables CANNOT improve the tone of your instrument with respect to non-true bypass tone loss, what it can do is minimise your tone loss in your OVERALL signal chain. if your talking about tone loss due to non-true bypassing, then its got nothing to do with the cable. if you use a better cable you will find that the tone loss is less than your worse cable, but the tone loss due to the non-true bypass is there. therefore, the only thing you can do if you don't like buffered bypass is to true bypass your pedal. then the tone loss will be EVEN LESSER after changing to true bypass, and EVEN EVEN LESSER after changing to better cables.
yea as suckasucks said, not easy to true bypass the newer mxr's cos the switch is pcb mounted. i had to cut out that portion of the pcb to fit in a new 3pdt into that small box just to true bypass my phase90. when u cut out must also be careful not to cut into another trace. another method would be to rehouse the pedal in a bigger enclosure, then u wont have to worry about sawing anything off.