Alright, think I got his torso sorted out. I think my heating and cooling method was mostly doing the trick, but went ahead and put in a few drops of shock oil which has me much more comfortable moving him around.
Also went ahead and used a Gundam pen on the stripes on his mid section. I like how they didn't paint those, but they did paint the whites of his finger nail beds.
Much happier with him now. Juggernaut's always been a favorite of mine, so I like the idea of buying the last one I'll ever need.