sticky extraction? flattened or flowed primers? most of my primers flatten a bit, usually a sign of a good max load for me. however if its flowed, like filling up the entire primer pocket its time to back off. thats how I do it anyway.
If you not comfortable with the load, what I would do in this circumstance, is back off 0.5g and test again, say 8.6g and see how things act.