Well first of all right after you create everything and its ready to be made into something dynamic.. delete history, all that modelling information isn't necessary...especially when you're dealing in dynamics and that can make a world of difference

secondly, I would use maya hair for this kind of feature, make the curves where you want the cable to be and end them where you want them to snap... then select both curves, and under the hair menu make them dynamic, then go into component mode, select the points that meet on the two curves and make a hair to hair constraint and key frame the glue attribute...

play around with that for a while and see what you come up with, you should end up with a much better result