The KR reading is what the PCM retards from the ignition advance. It lines up with our PM's earlier. Stock WOT timing is 15* You had your Cen-Tec showing 11*, so basically at that point you had 4* of KR. If you had 7* of KR, you'd be at 8* (assuming we're talking about WOT).
The fuel trims are the PCM's way of compensating for a rich or lean condition. It has a preset AFR it is trying to achieve, and the fuel trims are the percentage of fuel the PCM is having to add or remove to achieve that AFR. It's a little more complicated than that, but that's the basic gist of the idea. So if you have a rich condition your fuel trims will be negative since the PCM is pulling fuel (closing injectors faster than normal). If you have a lean condition fuel trims will be positive since the PCM is having to add fuel to achieve the AFR it wants.
I'm not 100% sure, but I believe the max advance is 50*.
