RE: Do I need to move on?
It depends on how much more throw you have.
My Kadet senior started out with 3/8" up or down and I went to 1/2" I could barely notice a difference in normal flight but there was a tremendous difference when doing any aerobatics.
On the other hand, my BrightStar on low rates is a great flyer, on high rates it is difficult to control. (low rate is 50%)
When you are ready start off with your regular low rate and have someone stand next to you. Once in the air you can switch to high (if high is too much and you are all over the sky the guy standing next to you can flip the rate switch back while you concentrate on flying)