Yeah, the 400lbs is a static load. For dynamic loading i.e. a person in a hammock, you typically want around 5 times or more the max load (your weight). We're not saying they won't work... at first and if you're careful, however they won't last long, the line will deteriorate quickly.
Paracord is generally not recommended for suspension either. However it would last longer as suspension due to the slightly higher breaking strength and the stretch (nylon) absorbing some of the load.
Saying that, you've made them now, you may as well try them. Hang low, check for wear often and try and catch it on camera if and when they fail Good luck.
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