Now that you have rearranged such that your speaker placed along the short wall I agree that the reflection points along the long walls are the 1st place for treatment.
I made DIY panels from ATS Acoustics. They have a nice web site. They served me well as I live in Illinois and have visited their place. Saves on shipping costs. The Roxul Rockboard 60 I used probably could be found local to you.
You might build a couple 2' by 2' panels and place them diagonally against the ceiling at the corners of the front wall. I used this approach using 2'x4' panels however my ceiling height was ~8.5'
I can't help to think you will like your new placement better. How far from speakers are you sitting?
I made DIY panels from ATS Acoustics. They have a nice web site. They served me well as I live in Illinois and have visited their place. Saves on shipping costs. The Roxul Rockboard 60 I used probably could be found local to you.
You might build a couple 2' by 2' panels and place them diagonally against the ceiling at the corners of the front wall. I used this approach using 2'x4' panels however my ceiling height was ~8.5'
I can't help to think you will like your new placement better. How far from speakers are you sitting?