I have had this problem over the years also... not so much smok issue - to me that means worn rings, but ring wear and knowing if they have bedded in or not. As Estyre said, they may not be worn in yet or they could have lined up. We i have had both problems. I have put in new sets before and they had low compression in each cylinder, so i have pulled it down and rang the ring builder, he said put it back together and run it in for longer. Sometimes they just take forever. I have also had broken rings and the line up issue. Can i suggest you purchase gapless rings from "Perfect Seal Piston Rings" he is located in Melbourne and i can assure you there will be no problems after this.