Hummm... Mine works as well but it just barely resets the trigger and it's the standard spring..Did you polish yours or just drop it in? Did it get better with use? I bought mine from Wilson and below is they're reply..
Thanks!
"This is common with these trigger conversion units. The only way to alleviate this is to work in the spring really well, and to keep the spring lubricated at all times. The rod that the spring rides on is not altogether very smooth and needs to be worked in for best operation. We stopped using these conversion units in our custom shop due to the issues were seeing, like the weak reset. We still sell them because a lot of people like them. They are made by Wolff. If the spring does not free up with in the first few weeks of use, it may be defective"