I am the biggest fan of the hammocks, but all 3 of mine were too wriggly by 12 months..........and they were really used to it.

Maybe if the day sleep thing is a problem, introduce a new set of sleep cues? I know when Lexie started bucking the day sleep recently, I hid her blankie through the day, and "found it" for her after lunch just before naptime. And now she gets that blankie = nap time.......