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Try a thicker oil. 5-40 or 10-40.
This is what I would recommend also on top of trying to stay out of boost for at least 500 miles to see how much it is burning.If its burning alot more in boost than it leads me to believe the compression is getting in the lower range. These cars do burn more the more you boost. Right now I have a Outfront block that is only burning .5 quart every 3000 miles which is awesome.
 

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I also just replaced my pcv valve, 105K. Went through a quart in less than 500 miles recently, was not burning any before the pcv failure. After the pcv replacement, back to 0 oil comsumption. Highly suggest replacing yours, since its only $40.
 
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