Kaw sourced plug wires are carbon impregnated string core "wires" and they often don't make good continuity from the plug cable core to the plug cap as they are a crimped connection that has a couple of barbs that are pushed thru the cable sheath into the cable carbon track core. I had exactly the same problem as when I split the cable there was only a carbon track and no string for about 1" from the end and the barbs had bent over not reaching the center of the spark cable core. Replaced both sides with these....
NGK (8328) LB01EP Spark Plug Cap
They have a screw in the cable end of the cap that runs up into the plug cable making a more positive connection. Not saying this is what your problem is but sounds a lot like a spark issue under load.
And the problem with Kaw replacement coils is the cable comes already attached and molded into the coil. I've got two brand new coils on my shelves before I figured out what was really going on.
NGK (8328) LB01EP Spark Plug Cap
They have a screw in the cable end of the cap that runs up into the plug cable making a more positive connection. Not saying this is what your problem is but sounds a lot like a spark issue under load.
And the problem with Kaw replacement coils is the cable comes already attached and molded into the coil. I've got two brand new coils on my shelves before I figured out what was really going on.