I would not worry to much about the oil. As long as it is not using very much and it is not causing any problems. I set up an aan motor this year for a rally car and it is pretty loose on the rings and it gets oil if it is running at low load for a long time. But when it is racing it gets tight. Last rally it burned less than a quart which includes blow by out of the crankcase vent.
Also make sure your crankcase ventilation is working properly and that the pcv valve is not broken or plugged.