I wonder if you have the new extractor as well.
I called Police Ordinance who is a Canadian distributors for Glock. They told me shoot it as is, if no problems don't replace the spring. They said if you replace the spring, chances are you will need the new extractor, which needs to be installed by a Glock factory gunsmith, ie. gun needs to be sent in.
I bought a new in box never fired one but it has the old spring and was eligible for the replacement spring. Just looked it up, call 1-877-745-8523, you will need your serial number because they do ask. I got it just in case I have a problem.