YOU CANT EXPECT THE OLD SPINNY BALLS BACK, GONE IS GONE.
As soon as the poly balls came to daily life, players all have set to complain of poor amount of spin with the novelty balls. But most of explanations about this phenomenon were solely non expert bla bla bla.
We looked into the matter from structural engineering standpoint and the actual reason is quiet obvious. Classical mechanics accounts this all pretty well. Plastic ABC and nitrozo celluloid known to differ in physical density by far, 1.40 versus 1.05. This makes all the difference between the two types of table tennis balls. It is quiet hopeless to get ball spin enough unless improved poly balls of high density ABC materials, come out onto market some tomorrou's day.
Be happy, prolonged patience makes you a real man.