I would increase the price on Luxury Boxes.
2 months ago, I was selling 5 constantly at $850. I bumped it to $925, lost one box holder. Brought it down to $900 and seemed to have brought the guy I lost back into the fold.
As for the courtside seats... I might bring the price down a bit ($150 is a pretty steep premium... especially with your 2nd tier seat at $35) and build some. I was selling out 125 seats @ $105 2 months ago... the increase in price I did to $110 hurt me a bit. But, I am a level lower than you as well.
You may lose some money short term... but should help out long term, especially if you are promoted this season. You might not have the funds to build your arena out next season (because you will be allocating those funds elsewhere).