Did the OP even demo this gear in person? If not, how did you know you would like the sound of this gear combo before you bought it?
Before Saturday, I would disconnect all the speakers except for the left and right main, with those two at the 60 deg isosceles triangle setup to the center listening position and at least 1 foot from the side and front walls. With all video sources off and the Integra in stereo mode with no room correction, I would play / stream some intimate jazz trio (bass, piano, drum) like Dr. Billy Taylor or similar and just listen. How does it sound? Is there 3 distinct sound sources in front of you with a nice soundstage? If not, you might need more room tuning like a large carpet on the floor, drapes on any decent sized window, etc., before going with major room tuning investments. If it does sound nice, maybe you are overpowering / complicating the room with all your additional speakers, starting with the center channel. Once you get it dialed in more with just the two channel, maybe connect the sub and try to find the best location for it (probably not in the center between the two mains / not under the center channel speaker).
Audio and AV setup is usually best if it is done incrementally, I think...