I like Taylors too. Firecore would be an equal. MSD makes a good wire too. You can order the ends you want and make them yourself too. Or grab the 90 degree terminals and boots separately and reterminate those. Funny thing with wires. Some last for...ever. Some don't. Condition-wise they all look the same...lol. Fact is if it's arcing - it's bad. Period. There might be other circumstances helping cause it, but from what you describe there isn't. 5 & 7 need some pretty firm looming to stay in decent shape, or grab those sleeves to protect them. Or put 90 ends on them...lol. Either way the energy has to get from the coil to the plug with no loss of power. And it's more important than anything else you might play with. If it runs bad, and the plugs look bad, then it's time to replace them, but they might only be the symptom and not the cause. Keep chasing it. Sounds like you're getting closer.
