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Make sure you set/check timing with the car hot and at idle, because the ECU changes timing when it is not. Base is supposed to be at 15° exactly, not jumping.
If it is jumping, it could be a temp sensor failure, a CAS failure, a TPS switch failure (if it does not detect idle, it does not switch to the idle timing map) ... or a wiring problem. I honestly dont think it is the TPS, as timing map is above 20° value near idle. But if it is lambda sensor issue, it could interfere too ...
I hope it is the temp sensor or the lambda, all others are costy repairs. Even the temp sensor is costy, i think it is 60€ + here. But seeing as a CAS is 200€+ ...
Cas is driven by the exhaust camshaft, the splines on the cas or the part driving it can wear. I think JWT has a replacement part for the splines on the camshaft. It usually is changed in pair, because, as soon as one of them develops wear and play, it starts grinding the other part.
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