Ok, a couple things that might help here:
a) Check the orientation of your check valve. Depending on the type of check valve you have in there it it might have to be mounted horizontally (ie. swing-type check valve). I see a vertically mounted check valve, so look into that.
b) You can by non-water hammer check valves. Google it, buy it, put it in, Bob's your Uncle.
c)Failing all of that, mount the check valve horizontally and put an expansion chamber before the valve. Don't go and buy one, just make if from some PVC. Again, google has some good info on how to do this. It's an easy operation.
That's all I've got for useful tips. Soon I might have to join the "You should have just plumbed without..." group .... Just kidding!
Let us know how it goes and let's see if we can't fix this.
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