You might consider longer runs of ICs rather than speaker wire if that is possible. If not check capacitance and resistance of cable you are considering.
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I have the same setup and have tried several different speaker cables. The note from Al above applied after the fact to what I have tried is what I found what works best now. I found that different cables sounded better with a high power system that I was using with B&W 802d speakers than what I am using now with my Avantgarde Duo Omega speakers. What type of amp and speakers are you using? I have a pair of 22' speaker cable for the farthest speaker and for the speaker that is just on the other side of the wall which is only about 3' away.
I have been using Mogami W2941 for the longest period of time.These cables are constructed of eight conductors.If configured as a stereo pair (4+4)they equal 10ga.I use them as 30ft.internal biwire which equals 13ga.at the spkr.end.I recently compared them to a 35ft.$4000.00 pair of MIT biwires and sold the MIT's they're that good.Other good choices from Mogami are the W2916(6 cond),and the W3104(4 cond).Many sources to purchase from,and reasonably priced.W2941 is around $7.50ft.W2919 $5.80ft.,and W3104 $4.07ft.Excellent value,used by many recording studios.
I just went through a similar change in my system. I had to change out from a 9' pair of Audience Au24. I made some speaker cable out of 10ga red enameled magnet wire. I bought a spool of it and then cut four 17' lengths and made two braided pairs with bare wire ends. So far I have been very underwhelmed by the sound I am getting. I would guess I have about 25-30 hours on them and I have not heard any improvements. I will give them at least 100 hours before passing final judgement but I don't expect too much. I don't know what would be in the wire that would need break in or dielectric run in.
Sorry that this doesn't provide any suggestions but I thought I might pass on my recent experience for a very similar situation.