your bolts are probably stretched already. Get new ones. or maybe it's a good time to get studs. Couple things:
- no thread locker
- do not torque them when they are hot - stretches the bolts
- your torque settings are good
- every year or two, or when you see/experience any defective behavior, get new bolts. Those are maintenance items for a tracker. The heat cycles anneal the metal, making them weaker.
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