Aeration must be it then.
I'm 100% with kratos that it's a pH problem, lockout, roots, or a combination. Aeration is generally most important for all.
Out of curiosity, how did you come to the conclusion your soil's pH was 7. How did you test it to reach that number?
If you tested it properly and your top soil is 7, then down the bottom could be much lower..
Also the bottom and centre is likely staying soggy longer than the top soil. Especially if your soil is heavy.. If there's root rot anywhere, that's where it'll be.
Looks like pH problems and root disease, caused by overwatering and lack of aeration. (in my honest opinion)
One thing to bare in mind too, is, if your soil's heavy, overwatered, or lacking aeration. Then rich organic matter isn't necessarily a good thing, including your microbial tea.
If your soil's environment is ripe for anaerobic bacteria and conditions, then your aerobic bacteria is being out competed. Aerobic tea will effectively be food for the anaerobic environment. It's balance which is most important.
If you're also finding you're having to water too often, because the top soil's drying out too fast. Add a layer of mulch to your top soil.
Good luck. All the best.
