Mine is 01/07. I never said my 350 was "noisy" with loose tolerances. I just thought you were comparing it to other 350's or Magnum springers.. I doubt yours is much different than mine. The way you describe your 350 is about the same as mine which is still being super-tuned right now so it will come back 10X better. My (untuned) 350 compared to a tuned Diana 36 I have, and compared to a Beeman R1 I have shot, "kicked" more and the report was louder. Like I said everything got better though after several hundred shots which is the norm, and the recoil seemed to have had diminished some, but the gun was accurate right from the box and there were really no issues with it. It just had some twang which mostly went away after 600-700 shots. It actually was very easy to cock for the power it had. Yours will improve too as it breaks in.
Enjoy it and shoot it in good health. I try and shoot them as much as I can. It relaxes me and puts a smile on my face :)