A/R's are produced every second. Millions, Billions! As you grow with each cycle, it is harder to gain each time. Before changing or upping doses, you must remember that to grow, you need fuel. Food, protien, Etc. To maintain muscle you have to eat to keep your body in an anabolic state.
You can stick with the same doses and steroids, but the food consumption has to increase each time to make gains.