Rel sub cable options

I just picked up a pair of S/510s that I'll be driving from PS Audio M1200 monoblocs.  I have some extra Kimber 8TC lying around and was planning on using a single run of each to each sub.  Using the Speakon 4-pole connector, I plan on using 8 conductors split in half for the 2 positive terminals and the other 8 conductors split in half for the 2 negative terminals; so there will be 4 individual conductors on each pole of the Speakon.

REL makes a big deal about talking about the resistance of the cable in concert with their input design.  Am I using too much wire and will it be a problem?  Almost everything I see for sale is only 2 conductors per pole.

Good idea?  Bad idea?  I already own all the pieces so there is no cost outlay.

After my post, I found the 'Russ Andrews' REL cable made from 8TC.  That is almost exactly what I'm going to do except.....where he has 2 leads for a right + channel and a left + channel, I'll combine the wires into one lead for a single + connection.  As I said, I'm using monoblocs.

So maybe I'm all set!? :-)

Signal Cable does not state what kind of solder it uses. I am wondering if it just regular and not pure silver solder as with the Rel Bassline Blue.