Ugh, another broken mount. Poly-Locs?
Nice set-up,, rack and pinion, very cool ...
Ya know, I always used a smaller linked chain, from that same head bolt and take it straight down to the K member, but you can't do that.. and that chain needs to be tighter.. imho
I kinda think your problem may be, with the mount attached to the frame the way it is,, - is it possible that he chain and mount are actually twisting the frame rail at launch ??
my .02