Disappearing oil

I have a 1999 subaru forester 191,000 miles on a 2.5 liter engine. I bought the car with two burnt valves. I pulled the heads and had them rebuilt. I put it back together and it seems to run fine I am getting a small amount of gasoline in the oil. As well as the car is using oil about a quart every 400 miles, but I am not getting any smoke other then a small puff of blue when it fires up on a cold moring. I thought that it was the rings so I did a compression test three cylinders have 160 psi and one has 150 psi. I have looked for leaks all over the plave. I was wondering if my cylinders are being washed with too much fuel or if it is something else?