Good to know that the end of this ordeal is in sight.
I would suggest you replace one part at a time and give it a thorough test before moving on to the next part.
I would start with the FPR as it seems to be most likely causing the problems laid down in this topic.
If the CPS needs aluminium foil, then that seems to be the next logical part to replace.
On your FPR questions regarding original or aftermarket, if I look at my go-to parts webshop (Skandix.de), then only an aftermarket part is still available. Both Bosch and Volvo genuine are listed as "discontinued". I have been using the aftermarket part for about five years now, and it's OK.
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