As for the “shoutiness” this is again somewhat of a horn attribute. However these are the least shouty horn speakers I’ve personally heard. Horns take a little adapting to and are not for everyone. Even the best of them.
I haven’t seen any specific measurements for this speaker, but as a general rule large cones can become more directional at the high end of their frequency spectrum. If you listen too far off axis the upper woofer frequencies drop off making the higher frequency horns sound relatively more pronounced and shouty. Correct toe in can help alleviate this. Seated ear height can affect this too. I find these speakers sound best if your ear height it’s toward the bottom edge of the horn +/-. Either lower seat or raise speakers. This puts you closer in alignment with the woofer axis. Set sitting height, then play with the tow in. Experiment with both one at a time.
I prefer a little closer distance on the speakers than some here... my current set up is 7’10” apart feet apart and seated 8’ from the face (not tweeter driver) of the speaker. I have them towed in so I can see maybe a 1 inch reveal of the inner sides of the speakers. Some of this is driven by my room constraints. But a starting point. You may want to buy some cheap plastic gliders to temporarily put under the feet of the speakers while you adjust. Maybe some under your seat too. And, if you’re anal like me, some clean gloves for handling the speakers. A laser measure device comes in handy for getting distances set. From a seated position hold laser measure against your ear and aim at the center of control panel.
I think second reflection point treatment is a good idea. 4 inches or thicker. I’ve never much liked 1st reflection point treatments..personal preference and room dependent. Some put large leafy artificial plants in front corners to help scatter sound. Oh yeah, ditch the analog equalizer. These speakers are highly, highly revealing and flaws in the upstream equipment or unnecessary components will be highlighted. Be patient, one move at a time and enjoy the music while experimenting.