I think you should trust your gut. There is a certain lens that can cause harm if it is innappropriately prescribed but I don't think it's common to have that.

It's my understanding that each time you get a new prescription, yours eyes get used to the "assistance", so theoretically, you are weakening your eyes a bit each time you go up.

But, I would think that would only be an arguement for upping prescription more often AND I don't even know if the above statement is true anyway.