The grandson of the inventor of Reese’s Peanut Butter Cups has lashed out at The Hershey Co. , accusing the candy company of hurting the Reese’s brand by shifting to cheaper ingredients in many products. Hershey acknowledges some recipe changes but said Wednesday that it was trying to meet consumer demand for innovation. High cocoa prices also have led Hershey and other manufacturers to experiment with using less chocolate in recent years. Brad Reese, 70, said in a Feb. 14 letter to Hershey’s