You didn't mention which film format that you are using so I will assume that you are using 35 mm. If you are exposing the film at the mfg rated speed and developing at the recommended times in the developer then I would recommend trying this. Cut your film speed in half (over expose by one stop). Cut your development time down by 15% from the recommended time. Target your negatives to print on grade three paper. The reduction in development time will reduce your grain problems. 35 mm needs all the help it can get with grain. Try to shoot one roll at this recommendation and development. If this doesn't help then I would be very surprised.