Roy Killough

Hi I am a new member here and have been wanting to ask a question about mouthpiece size. I play Bass Trombone and am currently using a Schilke 59 mouthpiece, should i continue to use this mouthpiece as i continue to learn Baritone? or should i look for a smaller mouthpiece and what brand? i don't know if certain corps want certain size and brand mouthpieces so we all match but if it helps to answer my question i want to audition for either Carolina crown, Cadets or Blue coats next year. If anyone has any suggestions or can help me figure this out it would be much appreciated!