Brownells makes a trigger track polishing stone that costs about $15. Thay may help. I've also had to polish the disconnector where it goes through the hole in the frame. It's a time consuming process, but that may help. As a first test, is to strip the gun and look at the trigger track and see how rough it is. It should be very smooth or you will get some of the behavior you describe.
I agree with the idea of having a professional do the work, but not just any gunsmith. Make sure they truly know 1911s.