I would leave "well enough" alone!! I would also leave the money in my wallet! I have spend significant money on cables over the years, but in my HT system (comparable to yours), I didn't hear a difference.
If you are worried about the jumpers, just strip about 4 inches of insulation off of the speaker end of the 12 gauge and feed it first through the bottom set of terminals and then to the top. Tighten both sets and you have instant jumpers.
Enjoy,
TIC
If you are worried about the jumpers, just strip about 4 inches of insulation off of the speaker end of the 12 gauge and feed it first through the bottom set of terminals and then to the top. Tighten both sets and you have instant jumpers.
Enjoy,
TIC