The best bet would for you to make a video of yourself driving, and post it here. That way people can see what you are doing wrong with your form, and give you help to improve it.
Are you driving standstill, x step, or full run up? How far are you throwing various discs?
I know when I took a few years off from playing and came back, my driving was atrocious. I went back to standstill driving, and working on my form. I know I throw my discs much farther when I am focusing on a good throw, rather than trying to focus on the distance by strong arming it.