Are you saying the measured AFR (using a wide band) was 17.5?

If the PCM is commanding 14.63 (as per the log file) and the result is 17.5, then the engine is either getting too much un-metered air (i.e. intake manifold leak or exhaust leak) or the engine is not get less fuel than the PCM "thinks" it is delivering Possibly one or more blocked injectors or injectors that are not flowing what they say they are.

P.S. The jagged spark data is exactly what I would expect when the PCM trying to maintain constant idle under difficult circumstances (i.e. starved of fuel).

If you want to see how badly the engine runs without the PCM using the spark to control the idle, set tables: B5935, and B5936 to zero.
You will most likely find that the idle speed hunts up and down over ever increasing rpm ranges until finally it gets too low and stalls.

Regards
Paul