I recommend doing a proper rebuild of the fuel distributor. You can get the parts for it here:
Fuel Metering Distributor repair kit for Bosch K - Jetronic 8 Cylinder - salvox
There's a guide on benzworld's r107 subforum on how to do it. Link:
http://www.benzworld.org/forums/r-c107-sl-slc-class/2205337-cis-fuel-distributor-rebuild.html
The diaphragm that rests between the heads of the distributor can go bad. The act of separating it for the cleaning most likely destroyed it.
It's very easy to do and there isn't any need to keep the ceramic hats and springs together. You just need to make sure you keep it clean.
Try that first and report back. You may have to invest in a KJET fuel pressure kit to diagnose further.