Personally for me, hills have gotten much easier as my experience and fitness level went up. Hills that would once make me cringe, I don't even notice anymore. I think some of the issue for you could be your low gearing. With gearing like that, you'll most likely never get any stronger. For me, what it took for me to get stronger was to get rid of my triple and move to a standard double. It took me a good year, but I finally got there.