There is a strain screw on the front, lower part of the grip frame. If it isn't completely tight, that could be the source of your 10% misfires. If it is not tight, tighten it up all the way and see if that doesn't cure your problem. Many folks loosen this screw to get a lighter trigger, but that is not the way to go about it.
No reason to send the gun, if there's no reason to send the gun, ya know!