it kept falling off of me too, so i tried the longer ear hook and just used the warm water like they say to bend it a little better to fit around my ear, it works for me, had no problems keeping it on my ear now. what i don't like, is the little soreness I get from wearing the ear hook all the time lol, but that's okay with me lol.
Just play around with your 2 diff ear hook and try to find the desire effect you want. The shorter hook, everytime I moved my head or look down, it kept falling off, once I was looking down the stairs and boom, it fell off and tumble all the way down the stairs! I was so worried! put it back on, it works! lol
Just take some time and play with them ear hooks and hopefully you can find your solution.
Best of luck with it.