By looking at ComeOwnMe(COM), it seems even if you set $20 or $14, you will still be only getting the attendance softcap of 20K attendance. So you should really be increasing your bleacher ticket prices. Try to compare with teams who are in the same situation as you.
One thing for sure, the attendance is capped at 20-21K. So no point lowering the bleacher prices any less if you are already getting 20K attendance.