Is Vyvance 60mg For ADD Too High Dose?

Hi there, my name is Alec and I take vyvance for ADD and over the course of the summer my doctor has been trying to tune me into the right does. The initial does of 30mg - 50mg had fading effects near the end of my day and with earlier doses fading around 3pm since I would awake and take my medication at 9am. This worked wonderfully for me concentration wise with minimal side effects, but I am a student in college and most of my after class work is done in the evening. That being said, 50mg worked well, but 60mg worked well for about a week then I took a 2 week break from vyvance because my summer school was done and there was no need to take it. Now when I take it, it makes me feel more add than without it except for when I am in an isolated room to study. Am I on too high a dose? I m considering going back down to 50mg but I don t want to do that if my body just needs more time to get used to the medicine again. I don t take it on weekends by the way, only when I have work to do. I also have never experienced withdraw on my weekends without vyvance like I ve read on some forums