Not having a true flat deck could very well be an issue BUT what jumped out at me was the “Hookie” inconsistency reported on torque loads on tightening. Run a thread shader to clear and clean the threads the bolts are going into and use the ARP lube all around the threads thinly but completely coated. It doesn’t have to be hooped and slathered on. The bolts should engage and evenly as well as smoothly torque down.