I agree with newbee. Your chair is too far away. You are hearing more of the room and less of the direct sound from the speakers. Setup is critical. Forget adhering to a specific formula. They can be useful for sure but are not absolute.
In additional, the equal distance measurement from the front wall and side wall usually doesn’t produce the best balance. I suggest you continue to experiment with your setup insofar as speaker position and listening position.
IME bass traps located in the front corners suck the life out of the sound with the exception of ASC tube traps which have variable reflectivity. You might try what you have at the back corners if possible.