Of course you can do anything you please, and any way you wish, however I tend to use those little mushroom heads on the AKA bars for a half dozen things, ( my spay skirt attachment point, my tramp re-enforcements, our ladder that we use to get in and out of the boat with our scuba tanks on, etc) and often have 5 or 6 things attached to them, if you stretch the 5/16 bungy cord over them you can't use them for anything else.
This is the setup I've been running for 2-3 yrs now and it seems to work really well, it's what I call quintuple redunency (5 levels of redundency).
By doubling the number of bungy to two on each side, I am effectively doubling the strength of each bungy, and also the usable stretch (like a 2 to 1 pulley would do). If any one of the bungy's breaks the other 3 continue to hold, then the spectra rudder line prevents the AMA from dropping down more than an inch or so (the grey rudder string is around 500 lbs break strength, and zero stretch).
We can have two people sitting completely on each AMA with no issues (we do that all the time when snorkeling). Also the easiest way to get on board the boat is to scurry up over the AMA's and onto the tramps when swimming and snorkeling (we actually spend more time off our boat (in the keys snorkeling) than on it), basically the boat gets us where we want to go...
My old 5/16 dia bungy finally wore out, (it was too loose for a long time and unsafe). I just bought some 1/4" marine bungy (only use black (no other color, ever)), and used a needle nose pliers to unscrew the caps, pulled out the old bungy, slipped in the new with a couple knots, I tied a knot around the safetety spectra line underneath so it wouldn't pull thru the cap. I don't think it took more than around 15-20 minutes to make the whole works.
Pretty simple and fool proof. (no need to over think stuff)