If after hearing the evidence in the proper preceedings, the court should find that the youthful offender has committed the acts charges against him, the court shall determine the imposable penalty, including any civil liability chargeable against him. However, instead of pronouncing judgment of conviction, the court upon application of the youthful offender and if it finds that the bast interest of the public as well as that of the offender will be served thereby, may suspend all further proceedings and commit such minor to the custody or care of the Department of Social Welfare and Development, or to any training institution operated by the government or any other responsible person until he shall have reached twenty-one years of age, orr for a shorter period as the court may deen proper, after considering the reports and recommendations of the Department of Social Welfare and Development or the government training institution or responsible person under whose care he has been commi