Bike runs awesome, fire second kick cold first kick hot, oil had very, very minimal silver in it when drained. No more than any other time I've gone 3 rides before changing.
Loose valves make alot of noise. There are other things too. See similar thread here on same subject less than a week ago. "God Aweful Noise ...."
You should be concerned and looking for cause. If all was set well in spec when the top end was done, the valves should tighten, not loosen. Why?