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Tuning Katran

I have a new Katran 22 cal. I’ve only fired it forty times. Before Utah shipped it to me they changed it to LH. The gauge says 2.5 bar but the pellets just fall out of the gun. Since originally sighting in its now 7 inch low and sounds weak.
I’ve called Utah three times seeking tech assistance and left a VM or two and gotten lots of voicemail ring thrus. No response yet.
Questions: Is something loose after the changeover to LH.? Something loosened in the valve system between tank and barrel. ?
Thanks for any advise.