I can tell you from experience that the XDm strikers will light strike if they get oil in the firing pin. Had this happen on my 45. Clean and lubricate (extremely light coating almost dry) reassemble and problem solved. Known issue easily remedied. They also make stronger spring kits for the XDm not sure about the XDS.
"The spirit of resistance to government is so valuable on certain occasions that I wish it to be always kept alive. It will often be exercised when wrong, but better so than not to be exercised at all." ~Thomas Jefferson