I immediately think weak/short mainspring. Maybe try your old original spring again.
Also check the frames breach block slider grooves for dirt/debris.
You also state the gun has been re-barreled within the last 8 years, with the receiver axle pin removed check that the breach block and toggle link assembly slide easily along the length of the receiver without feeling any abnormal resistance. Re-barreling puts incredible stress on the receiver if not done by a competent gunsmith with proper tools for the job.
Good luck.
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WTB - Take Down Lever & Trigger Plate (#90) for an Imperial Artillery.
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