Lots of bass at walls, lack of bass in center of room/listening position

I had a similar issue.. Solved.. Do you have 3 way tower speakers ? if so, try this.. I first found the perfect toe in.. Then I placed 3/4 in rubber pads underneath the front of my speakers to tilt it back some..  Improved my bass a lot.. Sounds crazy, maybe ? It works for me..  Note that my bass driver sits towards the bottom of the tower.. Good luck.. hope you find a solution

Good thing you are measuring your room/system. Terrible curves unfortunately. I would skip the subs or cross them at 30-40 Hz and use the Roon digital equalisation. Preferably using convolution filters. You seem to have a "loaded" room so I don't think acoustical treatment will give you much help.

Probably I need to keep playing with speaker positioning as you guys are saying. I'll try to keep moving them around. Right now they are 28 inches off the front wall with 10 degree toe in.

You can play with them till the end of time, no amount of moving them around will have the least effect on the underlying physics. Been there. Done that. Found a better way. Don't do that no mo.

OP:
We haven’t discussed your main speakers. What are they and where are they? It is possible they need more rear wall reinforcement. You also, 100% need mid-high frequency damping and dispersion.

If the former is true, moving the speakers towards the rear wall should help reduce the bass-mid imbalance. That is, you should get more bass out of these speakers.

Some one else mentioned Roon. Yes, if you have access to DSP and the other suggestions are not available to try first, this can help, but convolution filters are WAY overboard here. Simple parametric filters will fix everything you have, and not overtax your server.

However, room acoustics are the first place to go. You can’t fix your mid-HF hash with an EQ.

Also, the sub response honestly looks really good.  I was expecting to see a lot more garbage.  This is why I am suggesting that for now, you ignore it, and fix the mains.  That's where your problems are, and there's nothing you can do in the sub to fix this.