For me, my bowden cable nylon adjuster is missing. So I have absolutely no way of adjusting early or late shifts.

I have some of the problems you faced. You might want to check the bowden cable for the white nylon screw and tighten/loosen it for some effects. It may alleviate your problems..

__________________
1992 200E
M102
102.963
AKA Silver Old Grumpy
Always hope I can freeze someone with the aircon- Just change the compressor again, Subseal leaked with a psssssssss sound.
Its the NON-3 Pointed star items on my car that cost more to repair.$%^&%%*^&