Compensating for different speaker cable lengths

The minimum speaker cable run is 16' to the right channel of my system, but only 8' to the left channel. If I add a second 16' cable in parallel to the right channel, this will equalize the total resistance of each channel (although inductance and capacitance would be different). Alternatively, I could simply use a single 16' cable for each channel, or purchase a 16'/8' pair claimed to be insensitive to the differences in length (e.g., Ocos or Transparant). What is the best general solution to this problem relative to soundstage imaging and frequency response?