Plenty of people have paid $800 for PWR rad only for it fail after 3 months with no support from PWR.

China spec rads have come a long way. Using genuine coolant also helps.

I've had my China spec all alloy rad (also from ASI) in my car for at least 2 years now using only genuine coolant. No leaks. No problems. And it bolted up perfect.

I'd try getting another china rad, either by warranty from ASI if its been under 1 year, or just buying a new one. Flush all the old coolant out of the block and use only genuine Subaru coolant.

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RS Liberty - Because WRX's are only good for parts...