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I had to chase down a 1126 code recently and used the Durmatric but the terminology for the various fuel trim levels doesn't match what you have from the generic scanner.
I'm guessing here but I think the two values you're listing of 28 and 29 percent might be saying the computer is trying to give the motor about 30% more fuel. The reason I'm saying that is 30% is the limit before it throws the code.
When I tracked down my problem I had the car smoke tested to locate vacuum leaks but fixing them didn't keep the code away. It would come back after a couple weeks. In my case a new MAF sensor at $277 totally fixed the car. You could try cleaning the MAF sensor but I tried that and it didn't work for me. Normally I don't favor throwing parts at the car to fix a problem but it would have saved me money compared to the other things I did before I broke down and bought a new MAF sensor.
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