Problem in Continuous Casting of Resulfurized Steel

Hello. I am Javad, working at Esfahan's Mobarakeh Steel Company. Our faculty decided to produce free cutting steels (analysis: 0.05% C - 0.003% Al - 0.05% P - 0.3% S - 0.9% Mn - 70 ppm B) through CCM. At first try there was a breakout because of sticking to mold. Would you mind answering my question?

How can I prevent breakout?

How can I figure out that all of the liquids solidify in Monotectic and does not remain any liquid to solidify in Pretectic?

Is 0.9 Mn enough to preventing FeS production?

Thank you!