Tensile pre-load of bolts is often necessary to extended their fatigue life in application. So unless you've done some serious modeling or testing I don't think this is sound advice. https://www.asminternational.org/documents/10192/20564188/amp17208p18.pdf
It does appear there may be a manufacturing quality problem and/or design flaw in the 3's roof rack. Tesla needs to get on top of this.
100% agree with this. I would rather it snap under tension that I’m applying than tension from wind.