You should definately raise the price of your bleachers to 10-12, as thats's a lot of money your not getting.
For example, right now, if your bleachers sell out, they get you $37 675.
If you raise the price to 11, if they sell out, they get you $59 345.
That's over $20 000 more that you earn each week.
You also might want to consider investing money into expanding your arena. Although you have plenty of luxury boxes for an II team, so you dont need to make more of those. Instead, build more bleachers and lower tier, as they cost less to build and make you more money.