GERMANY'S CAUTIOUS COURSE
The West German economic recovery is proving even stronger than Government projections had foreseen. But efforts by the United States to get Bonn to step on the gas and assert its role as the engine of Europe are running into stiff resistance here. ''I am concerned at how lightheartedly we are urged again and again to fiscal stimulus,'' Karl Otto Pohl, the Bundesbank president, said in an interview. Bankers and economists agree that the Government's cautious fiscal and monetary policy mix has yielded rock-bottom inflation rates, now running at below 2 percent, and provided financial underpinning for a second year in a row with a record trade surplus, expected to reach $29.3 billion in 1985. And, with the crucial metalworking industry announcing last week that 206,000 jobs had been created since mid-1984, there has even been a sense of late that the worst may be over on the unemployment front.