YouTube - Wogtech Goaltending Instructional Video 1/4
watch this video, their is a couple more he made aswell. Im going to say it is more then likelyy the way your push leg is angled or you are twisting your body. your leg could also be to far away to get strenght. strenght won't make you go in circles, it will determine distance, speed and control.
good luck!
also 135 ish, not exactly the same but it can help you, you have to get your leg in the right spot to get the most power.
YouTube - Goalies 7 Zone Drill
105
YouTube - goaltending drills