Are you sure the resevoirs isn't hitting the frame or plastic?
I heard about having to make room for the resevoirs for some aftermarket shocks...

 

I don't think so but I'll check, I did mount one resevoir forward because overflow bottle in the way, and the other side is mounted with resevoir back, but didn't think that should make any difference?
Rick

 

i have walker evans they make a sound when they are fully extended pick up on your front end and see if you hear it i can on mine

 

I think thats just the noise when you top out the shock...there might not be a top out bumper like there is a bottom out bumper...PoPo's will do it too.

 

Take the shock off and see how much slop there is at the bolt and the shock mounts. SLOPPY! When the shock extends or drops out it takes up all that slop and the tolerance in the heim, spacers and bolt. Welcome to solid mount Heim ends.