Thats one of the worst FS 180s I've ever seen and that is why you can't do a 360. You are basicly forcing the spin by turning your upperbody before the jump then relying on that to swing your legs around. Using that technique 180 is the most you could ever spin. Even if you went off a 100ft jump.
We start by fixing your FS 180. Right now you are jumping with your left hand past your heel edge and your right hand past your toe edge. That is the exact opposite of what you want to be doing for a frontside spin. You want to wind up before the jump and unwind as you jump. For a 180 this doesn't require much prewind.
Thats all I'm saying as this says everything else much better. YouTube - How to 360, 540 and 720 Frontside or Backside (regular riders) from Snowboard Addiction.