Look, there's nothing wrong with arias pistons and rings - provided they are fitted correctly and run in correctly.
By the sounds of it the guy who put the full syunthetic oil for the run in didn't know WTF he was doing. U NEVER use synthgetic oil for the run in.
Try chris32's option, and if that doesnt work u may have to go for a re hone on the cylinders.
Arias are good pistons (most piston companies are supplied their rings by wiesco) so dont believe the BS someone is feedig you.