Chamber cleaned with a Chamber brush/CLP to get out all the storage grease before it was shot?
Your not using Hoppes solvent to clean the barrel right? it leaves behind a residue that collets with the powder fouling to cause problems very quickly. As for lube, hoppes gun oil is not the right stuff either, and should be using CLP.
Upper bearing surfaces lubed on the wetter side with CLP for break in?
When pulling back on the ejection handle, the face of the bolt stops in from on the ejection port around 1/4", and does not retract back past the back edge of the ejection port?
Extractor spring is strong, and the ejector is moving freely in the bolt face channel, just under a great deal of spring tension?
Ammo being used for break in is not steel case coated ammo, but brass case factory ammo instead?