Did a little more testing in the pool earlier today ( now y'day). Spent some time analyzing the action on the new X with th ehelp of my daughter. Rigged two rods with 4-4.5 ft leaders, and had my daughter simultaneously walk two plugs down the length of the pool at a moderate pace while I observed underwater with goggles.

Two more obsevations:

1) I've already mentioned the wider wobble, but the new plug also undulates at just a little slower pace than the standard.

2) The K16-X definitely runs at a steeper line angle. It ran well over one foot deeper on the short 4-4.5 ft "leash" we used for testing.

Ran a K15 as well for comparison.... just got my very own I-fish Cheese Measles in a K-15 the other day. The swimming action of the K16-X was much more like that of the K15 than the std K16.