All estimates are merely estimates.  It seems you have nothing to offer except denial:  Denial that Idi Amin was supported by the USSR, denial that the Stasi executed anyone for political reasons, dismissal of all sources to the contrary.  You want me to accept Coatsworth, while claiming Rummel is "discredited"?  You want me to accept Argentina as a US client, while refusing to accept Uganda as a Soviet client?   Here's a report from the time:  "While the United States had supplied Argentina with considerable assistance over many years before 1977, it was only in 1976 that the truly repressive Videla regime came to power.  Within a year of the coup, the United States terminated its arms sales to Argentina.  Furthermore, the United States has continually denounced Argentinian repression in international forums, whereas the Soviet Union has come to their defense....Argentina has played a vital role in sabotaging the grain embargo on the Soviet Union."  Here's another:  "Argentina has redirected its normal pattern of trade to a greater extent than any of the other grain exporters in 1979.  Pursuing an aggressive marketing strategy after abolishing its Grain Board some time before, the government allowed its companies to replace all the U.S. orders they could. It reduced customary exports to Italy, Spain, Japan, Chile, and Peru, selling nearly all of its exportable corn and grain sorghum surplus to the Soviet Union. In return, it received prices of almost 25 cents over the American selling price from the desparate Soviet foreign trade organization responsible for grain imports, Export Khleb. In addition, Export Khleb wooed Argentina into an agreement to sell 20 million tons of corn and grain sorghum, and 2.5 million tons of soybeans to the Soviets over the next five years. The Soviet Vice Minister of Foreign Trade even predicted in April a tripling of total trade between the USSR and Argentina in the next few years."  And another: "This poor harvest did not prevent Argentina from expanding its grain exports to the Soviet Union."  And  another:  "Soviet propaganda and other support for Argentina during the South Atlantic war contrasted favorably in Argentine eyes with US support for the United Kingdom."