Well I figured, what the hell, and tried the Bars Leaks 1111. The car DID run cooler afterwards but not as cool as it should. I test drove it for about 20 miles. I got the "low coolant" warning. I thought I had it topped off but it's possible it was low so I topped it off again. I drove it to work today and got the low coolant warning on the way home. I just checked it now and the reservoir was about half full. I attempted to burp the system. It couldn't be done due to the foam.
So the head gasket is still leaking and putting air in the cooling system. This builds pressure until the cap releases it resulting in a loss of coolant out the cap.
Oh well. It runs cooler though, about the same as when I tried Blue Devil. Previously my way around coolant loss was to just barely tighten the cap. This allowed it to bleed pressure all the time. I still lost coolant but not very fast. It also prevented coolant from entering the cylinder when it sat overnight.