Couple questions, all about bolts.

I think that just backing them off and retorquing them will still add more stretch to them.

Moper is correct about the breakaway torque to start the bolt turning is more than the dynamic torque to keep it turning. That is because static friction (needed to begin motions) is higher than dynamic (moving) friction (needed to keep it moving once started).

But to keep from adding any stretch to them just to verify the torque, just torque them to the recommended spec and call it good... If you do this it will still fall in the lower tolerance allowed for the torque spec and not add any more stretch to the bolt...