I think that is way too low. I would double check a torque chart somewhere. It is a good thing you're using Stover nuts though. I have never shimmed them before. I don't think it will be an issue by any means.
Hmmm.. I know if they're too tight, they will cause it to bind and ride rougher. But I also dont want them to be too loose. I had them as tight as I could get them before, and I took the spring out of the spring due to binding... The truck rode like a log wagon...



