Hey man I'm new here and am having the same issue, bending dog bones every time I take her out. Frustrating as hell. I even tried the cvd ones I believe they're made for hsp/exceed trucks, found on ebay and the same size as Volcano dog bones....they bent 1st time out.
Did you try replacing your cups? Once they get worn sometiems I've noticed they allow to much play for the ends. Also I've heard using small o rings on both ends of the dog bone to prevent to much play, have been looking for small enough o rings myself. Lastly check your steering, I had a way overpowered servo in mine and it turned my wheels to much, almost forcefully, causing the dog bone ends to bend.
Hope some of this helps ya, if I find anything more out I'll be sure to let you know.