Yeah I hear you. No, you don't need the fancy stuff and it's nice when things are humming along. I often believe that less is more and subscribe to the maxim, "if it ain't broke."
Where I have used neem differently and found it beneficial is in the form of cake. I believe it is a good source of slow release N and may improve immunity if ever so slightly. I've observed colonies.
If you create a microbe rich soil, most of these problems would be non-existent. In balance as it were. IME, adding a bunch of side supplements can cause plant and soil problems and sometimes lead to pest and fungal immunities and other FUBARs. KISS it. If you are insistent on implementing your program or actually have a need for a program I might suggest an OMRI approved fungicide. Use foliarly for airborne and root drench for root rot diseases. Used as a drench, these beneficials can even potentially improve the health of plant roots.
Neem is an effective part of anyone's IPM program and used alternately with other tools can be extremely effective in control, i.e. when used at appropriate strength and dosing intervals. That speaks to most things doesn't it? That's been my experience anyway brah. I hope it helps.
Oh, BTW you know Azamax is neem right? Part of it anyway. It's azadirachtin extracted from neem. In many ways you are paying for the extraction and along the way losing the benefit of all the other elements within neem. The trick is finding an affordable product that has enough neem in it
Aloha
M