wive's tales.
I guess, the crash (tip over) bar installation could effect the steering if, the bars were installed with the bike sitting on the side stand and the bolt was hammered through the hole in the block and through the frame ears.
Now, I installed my Rivco bars a few years ago with the bike on the side stand (remember, I belly ached about the poor fit and how I had to take a die grinder to the lower weldment to get it to fit...) and I had to use an alignment bar to get the capscrew back through the frame ears and motor bolck...and I torqued it back up with the bike on the side stand (it was a mutha getting that bolt in there with the engine fallen down and the holes not lining up and all). Guess what, I've never had a pull to the left or right because the tolerance between the frame holes and the hole in the block is close, that is, everything has to line up to get the capscrew back in.
The engine on a Rock is a stressed member. It's basically a monocoque frame design, like so many bikes aree today and that makes the frame/engine combination, extremely rigid and flex free.
I think it's a caliper hanging up. There is no way that through hole and the frame holes are large enough in diameter to cause a steering pull either way and the Rocket isn't a flexi-flyer in the frame department anyway.