Steve, if you check trims immediately after clearing codes I think you will see they have reset. On this system, code clearing also clears trims. Check it yourself to see if that is correct. Powering systems down clears nothing from most modern systems due to them using non volatile memory.

Is that using a Hitachi maf? If so, did you try with it disconnected?

What way did you measure the lambda voltage? I am pretty sure that should not have a floating ground on the lambda so you should check this. When it is reacting right what are the min and max readings?

If I read this right you have good lambda switching and emissions until just before it reaches 80deg? Does it degrade gradually or suddenly? If suddenly you could take a snap shot of all available data just before it goes bad and compare to one after it does. Also plot the CTS.

Can you check that the injection PW reacts to the lambda input?

Your vac is too low at 17. Check compressions both wet and dry. Could be suffering a bit of bore wash, ie a symptom rather that a cause.