Go to ebay and search for "WE 10ga wire"
Find wire offered by tajacobs, which is still available in various lengths for less than $4/foot.
This wire already comes as a twisted pair and provides a full 10 awg to each pole.
The twisted pair is fairly small in diameter and is quite flexible. The wire is stranded, tinned copper that you can connect directly to your binding posts, without connectors, or you can add your choice of soldered or crimped spades or bananas.
If you need a visual upgrade, simply put the pair inside 3/8-inch techflex and finish with a piece of heat shrink at each end.
I run two twisted pairs of this wire to each speaker in a bi-wire configuration. I occasionally compare this wire with other double-run, bi-wire cables I also own, which include Furutech's OCC stranded cables, the same OCC HT Pro-11+ (and Pro 9+) solid core cables that you currently have, DYI solid core copper in cotton cables, and Homegrown Audio's X-32 solid core sliver cables. Each time I do this, the WE wire remains in my system after the comparison.
Some folks dis this stuff as not being a serious cable since it is not boutique, doesn't cost much and wasn't designed as an audiophile-specific product....how could it possibly sound as good as something costing $1K or more? IMO it does nothing wrong, provides an even-handed presentation without being hot on top or too loose/boomy in the bass, while offering perhaps the most tonally musical midrange I have heard from a cable.
Give it a try...what do you have to loose? Just buy the cable and hook it up before you spend time adding connectors or tech flex. I suspect will be pleasantly surprised and not just "for the money."