Sounds like a non issue to me. If you torque them correctly on install and re torque after a couple heat cycles, then you are done. Stop obsessing.

 

Mine loosen up too. I have had to retorque 2x since having the car back out. I defn wouldn't stop thinking about it, because if they loosen up it will leak at some point. I have already seen that happen. If it does it again, ill go right to red loctite....but that really shouldnt be necessary.

 

Did you change out the valley cover bolts? I think on the 92mm fasts, its suppose to come with bolts for the valley cover, more low profile ones...Actually im sure of it, Ive seen them installed. Those bolts are shiney ones too..