Santa - the other guys said it...
I believe your new cylinders would have had a criss-cross pattern cut into the wall to retain oil. It's like that because there's no way to machine a cylinder to be a perfect fit for the piston that goes inside it. The cylinder bore will actually end up being slightly ovoid in section, owing to the sideways forces exerted by the crank arrangement.
Unlike a car, where the advice is (or was, in decades past) to baby the engine, in an aircraft engine it's the worst thing you can do. The engine needs to be worked hard so that the pressure in the cylinders forces the piston rings against the cylinder walls so that they can wear away the criss-cross oil retaining grooves. Like Mav says, if you baby the engine, the pressure in the cylinders will be inadequate to force the piston rings against the cylinder walls. Oil will get past the piston rings and will form a glaze on the cylinder walls. Oil consumption may be excessive, and you won't get proper compression. Engine strip down is a likely next step.
Next time you fly with a new engine, work that engine - hard!