I got roughly the same effect that you did when I went from 10mg pills to 30mg. There will be some adjustment period for your body. That part should level out.
I went from 30 mg a day to 90mg and was able to accomplish so many things. It took me a while to realize that it was very easy to push myself too much and over do it.
I call it the "seduction of accomplishment." Finally acheiving things made me feel good. So like with anything enjoyable we tend to over do it. All the effort I had been putting forth to compensate was now driving me too much, so i had to learn to not push myself so hard.
There is also the possibility that Adderal is not the right medication for you, but 20mg a day is typically not too much for ADHD brains to adjust to.
Keep an eye on your Caffiene intake also.
As far as being calm. I do not have a hyperactive body, but my brain is hyperactive (racing thoughts). With my meds my brain and body work together now so outwardly I probably look more hyper.
I'm just a differernt flavor of crazy when Im medicated. LOL
I have heard from both my psychiatrist and my pharmacist that the meds may do that to you at first. I am on Strattera, which is a non-stimulant, but it did make me very, very anxious up until a few days ago (I've only been on it for 2 weeks) They said around week 3 is the magic week for most people for the jittery feelings to subside.