Good answer.
Your body will build a tollerance to just about anything. So you just have to listen to your body. And yes, diet is key. Are you eating as much as your last cycle of 10mgs? And you can't expect to grow the same every cycle if you dont build on that diet and eat more.
A wise man once said, "If you wan't to be 250lbs of muscle you need to eat like a 275lb man." And once I got there he said, "If you want to be 275lbs of muscle, you need to eat like a 300lb man." You can see where this is going.