There are experts here that will add more but in my opinion, with a room similar in size to yours, your resonance will strong around 30 Hz. There is little you can do to treat that other than changing the locations of your speakers and listening position.
My suggestion is to start with your LP at least 5' from the back wall. Then either follow the Sumiko grand master setup procedure or use the Cardas rules to locate your speakers.
In my experience, You really have to locate them based on the low end first and then tweak to achieve your best midrange etc.
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