the reason I suggest the CO///mixture adjustment is because that screw physically changes the fuel input at base idle...just like a carb.
If your only problem is at idle then I'd go there first.
The reason I say go here now is that you've check off all these other things on your list, is as I said you just did a complete rebuild and the setting here the CO was for the engine as is ran before and who knows who adjusted it when.
If it has an effect then you can proceed to set it with either a Dwell Meter....Test Point is on the Drivers side just in front of the shock tower...Black cnnector single wire. Set Dwell to 4 cyl....45Degrees is the where you want to get it with the screw. Lift the Allen wrench off the screw to confirm...the weight of the wrench will effect the reading.
Volvo_Problem_Solver_--_Advanced_Edition(1).pdf
cut an paste this link into your browser...you should get a pop up dialoge OPEN or DOWNLOAD
https://files.me.com/dustinl.c/le9rdc
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