It's not really biwire since you're using only one cable plus jumpers. But I have tried the diagonal wiring you described and it did improve the sonics.
Nordost also says to try using the jumpers diagonally; it would look like criss-crossed cables. This also worked well for me.
Nordost also says to try using the jumpers diagonally; it would look like criss-crossed cables. This also worked well for me.