Recommended bungee for a fat plane?

By fusionfab in Technical tasks,
Hey everyone  as some of you may know. My Subaru converted mk4 is sitting at 716lbs empty weight and I'm noticing that my new bungees 3/8", 90" long and 8 wraps is flexing quite a bit. The heats stance is pretty wide at empty weight and the tires running on the inside edges.  Any suggestions or advice whether or not this is ok and if not what would be a better bungee setup to go with? 1/2" maybe? More wraps? thanks everyone 
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