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Okay I think I worked out what is going on with my jcm.
It looks like MorphingClothes multiples the morph target values by whatever value is in deltaAddDelta when transferring to the clothing item, so in the case of the Kick jcm it was multiplying by -0.016667 aka 1/60th. This tallies with what Cage said, that the jcm morph should be at 1.0 at -60 degrees. Sooooo my earlier jcm morph transfer was getting 1/60th of the correct value, add a bit of rounding error and I can see how things would work at low kick angles but deteriotate a higher angles, and explains why I was having to use a value of deltaAddDelta 1.
I didn't realise Morping Clothes did that, but now that I do know I can easily work around it. All I need to do is copy Antonia cr2 and set the deltaAddDelta to 1 or -1 for the jcm morphs, and then transfer to the clothing item through Morphing Clothes .

Ok I tried my suggested work around and the morphs come out 60 times bigger so it appears to be a valid theory. I now need set up the jcm in the shorts again, but I learned something, and that's got to be a good thing,

It sounds like you're getting there.

Morphing clothes can transfer the morph part of the JCM's quite well, but I couldn't find a setting that handled the ERC portion correctly.  It either linked the morph to a Body FBM dial incorrectly, or did something completely wrong when linking to the correct joint rotation.  I found it most straightforward to just delete all of the JCM ERC added by Morphing Clothes, then copy the correct version over from the original Antonia .cr2.  Maybe someone with a better knowledge of Morphing Clothes knows how to get all of it right using just that program.  I found it useful only for transferring the morphs.

And it can definitely do that fairly well.  If the correct morphs have been transferred over, they should be set to reach 1.0 at -60 bend for both legs and 60/-60 for spread on left/right.  I'm probably only confusing matters with my efforts to explain.    As Rogerbee1 said earlier, keep at it.  Progress is being made.  ERC can be a tricky beast.  :D 

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.