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Those are 22mm MO fittings (Metric O-Ring) and not designed for copper crush washers. Did they not supply a torque spec for those fittings? According to a manual I wrote a while back, the ORB fittings on a Setrab core should be torqued to 29.5 ft-lbs and you should be using a wrench on the Setrab core to prevent that torque from ripping the fitting off of the core. Furthermore, the o-rings need to be lubed prior to installing the fittings to prevent them from galling and/or bunching up. Also be sure to use a wrench to support the MO fitting when installing the AN fitting as well.
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