Sounds like excessive blow by to me. The oil misting and soaked breather, oil consumption and smoke all indicate worn rings, The engine may not have been assembled correctly 7 years ago, the rings sound like they are sticking and not sealing. Run a compression test to test this out. How much do you know about the machine work done to the motor?? Did you take it apart before installing?? Just try to eliminate any questions before pulling the motor again!
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