The company behind a highly controversial proposed wind farm off the coast of Cape Cod announced yesterday that the project could be 14 percent smaller than previously anticipated, thanks to technological improvements. Under the revised plan, Cape Wind Associates would build 130 rather than 170 wind turbines over 24 rather than 28 square miles of ocean. The resulting project would still provide the same amount of power — a maximum output of 420 megawatts. But the reduction in scale hasn’t placated opponents, who say the project would harm wildlife and ruin the region’s famed ocean vistas. “A few more turbines, a few less turbines, now I don’t know what to believe except that this continues to be a corporate land grab,” said Alliance to Protect Nantucket Sound Executive Director Isaac Rosen. His organization is one of many that is challenging the Cape Wind project in court.