I must add that my Jasper has now resorted to "fur mowing". It all started when our son moved back home a few months ago. But I also believe that he has developed an allergy to the turkey raw food that he has been eating exclusively for almost 2 years as he once again has the rippling fur also. From what I have read about FHS is that the most extreme cases are those where the kitty seems to hallucinate and attack their tail, sometimes they go as far as to even biting it off. Luckily Jasper has never experienced these symptoms. So I am now doing various food trials to see if I can once again find him some relief. This is a great article on Fur Mowing for those who would like more info.
http://www.marvistavet.com/html/feline_fur-mowing.html