Make sure that you use the same embouchure and horn angle for sop as for your other horns. Still blow 'warm' air, and fill up the horn. Take plenty of mouthpiece, especially on sop. I would go up in reed strength. A 2 rico is pretty soft. Maybe try a RJS 2M or 2H.
I also recommend no baffle mouthpieces and a closer tip than used on other saxes. For example, on tenor I'm playing a .125 (about a 9 or 9*), while on sop I'm playing a barone 6 tip.
I also recommend no baffle mouthpieces and a closer tip than used on other saxes. For example, on tenor I'm playing a .125 (about a 9 or 9*), while on sop I'm playing a barone 6 tip.