I don't know if I can help you,I just want to say that don't give up on this,continual practice can make the improvement.
I just started on digital art (I think),and I am not adopt in the touch of the tablet (BTW I think I use the same tablet as yours)
I always think that if I keep use this tool for a long time,I can make this happend
So,just don't give up,keep practice and you can receive the good effect
Also give this speech to myself.