Im in the process of fitting an infinity stainles steel grip to an STI EXECUTIVE. I notice now when I slide the MSH up it engages the hammer strut before it's fully in place. Strut is in cup. Seems to put a lot of pressure on the hammer making trigger pull crazy hard. Is it normal to have to fit a strut? Any help would be appreciated. Also I'm using the infinity ignition kit (infinity hammer, sear, disconnect, and 3 finger).