When you installed the kit, was the VQ hammer/bushing a tight fit? The hammer must move freely on the bushing, no hanging up or hesitating as it drops. Check to see how easily the hammer pivots. If it's too tight a fit, it might be hesitating or hanging up enough to cause a light strike, now and then. If so, I'd polish all the contact surfaces of all parts that ride on that hammer pin - disconnector, bushing, hammer and safety.
I did one MKIII that had that issue, but a good polish with a stone cured it. Let us know how it goes.