I've revisited the topic of bi wiring now that my system has changed since I last posted my observations. What I've found is this:
Before I settled on my present system, using the bottom two posts gave the best results (with jumper cables). It is also the way JBL recommends the way to do it when using a single set of SCs.
Using the top two seemed to confuse the sound and rob it of it's naturalness.
Using the bottom terminal for the Plus cable and the top, opposing side for the Neg cable audibly improved the sound, making me wonder if going full bi wire (or using another pair of SC) would result in bigger gains.
If lazy, I would have stopped right there as the sound was more alive, believable, and fuller sounding. Scrounging through my older cable sets I came up with some Tempo Electric 16GA solid silver SCs with bare wire ends and used those for the top terminals and my Cabledyne Ulitmates (10GA) with locking banana plugs for the bottom two bass terminals.
What I got was the most believable sounding presentation yet. It's more relaxed and natural sounding compared to before. There was so much MIA in regards to background playing, singing, etc. that this new set up revealed. The only downside, if it is that, is a lessening of the bass in regards as to how forceful it can sound. It's there and it's detailed, complex and full of timbre and grit but it doesn't overpower like it used to. It could be that it's now properly presented compared to before. In fact, the bass I'm getting is eleciting sympathetic vibrations higher up the scale than before and at lower SPLs.That seems to indicate it's a lot more accurate.
It seems that some speakers are truly bi wirable and not done for the sake of gimmicks. I called the dealer where I got them from and they assured me that they are truly meant to be bi wired to sound their best.
Now I'm at that point where do I settle with the awkward look of the competing wires or go for a set of SCs that are purpose made and look the part. A high end dealer I conferred with just laughed and said he'd just keep it the way it is and not be in a hurry and just enjoy the music.
One more thing I noticed is that after hours of playing, my integrated runs cooler to the touch, barely getting warmer and I thought, if anything, it'd run a bit warmer because of the extra load that another set of SCs would bring to the equation.
All the best,