as somebody once told me, dont get wound up too much by the numbers..
i got really frustrated with my old rifle and got rid of it, but there was actually nothing wrong with it.. it was still giving 5p groups at 35 yards when i did my bit but i got too wouynd up by inconsistent chrono results!!
so thats my advice, dont worry TOO MUCH about it.
if it still shoots fine ...
good luck mate, SKoT