Amy,

Before anything let me say I have made exactly one clothing item to date ( as immediately above )which includes JCM, so I'm still learning, and may well have things mixed up.....

I think -60 is a good choice if you are doing a JCM for Antonia's Kick movement. This is because at that angle the morph will be set, by the JCM mechanism, at a value of 1 if you use the same ratio as odf used for Antonia's JCM's there ( 0.016667  which is 1/60th).

I made my JCM morphs, firtly by using 'Morphing Clothes' application to transfer Antonia's JCM's into my conforming shorts, but as a dial up morph without JCM at that point. This was a partial solution, and I then used Posers morph tools to fix up the morph which the shorts were conformed to Antonia, with her leg bent. I then deleted Antonia from the scene, leaving me with a pair of shorts which still had the combined morphs ( Xferred from Antonia, plus custom from the morph tool) I then exported the affected groups from the shorts as morph targets ( to combine the morphs into one ). and use this as the target for my shorts JCM for that movement.

I had to do this for each JCM I wanted. If your clothing has more than one group then you need to export each affected part, for each JCM morph you create.  eg if you have hip2 and lThigh involved in left kick, then both of these parts need a left Kick JCM morph.

Cheers

Ian