I can't really work out what to do with Jetfire's straps in alt mode.
Stomper, in your pic, as well as in the instructions, it says to clip them together:
But it just doesn't seem to have any place to affix to. Am I missing something?
In Peaugh's video, he keeps them disconnected and the legs go over them leaving the clasps nicely tucked between his thigh and the back of his shin.
Based on my lack of finding someplace to affix them to, I've found that to be a better solution.