You have an "M" pump on your vehicle. Is this a Euro? Instructions for the US-style cars with the "MW" pump likely won't be applicable to your vehicle. Adjustment to the VCV is done by turning the body. Have a helper press the accelerator to the floor, loosen the 2 bolts and allow the body to flick CCW. Turn it CW until you feel resistance then tighten the bolts. There should also be a restrictor orifice going into one of the inlets that seems to be missing on yours. Without the restrictor orifice, you'll get way too much vacuum and flaring/slow shifts will certainly be a result.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]