Just read that you've also changed the injectors. Do you still have the old? If the new injectors were not a balanced set (opening pressures adjusted so that they all fall within a 5 bar range) then your idle may be rough regardless of anything else you do. If you still have the old, I'd put those back in. You may want to have a Bosch shop test them first and reset the pressures to make them a balanced set (or do same with your new injectors if the old are already gone).

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC