O.k., lots to tackle here...
"Fungal blooms". Not in tea they don't. We get little hyphal growth, even in undamaged hyphae, in the tea. We are more looking to free up spores and get them in the mix. When they get to that soil, hopefully we get our bloom...
Whose eating fungi? Well just about everybody. Not so much the bacteria, they are more clean-up crew where fungi is concerned, but I have watched amoebaooze over spores and digest them, fungal feeding nematodes stick stylets in them and suck them dry, and of course worms, mites, etc, etc,...
Here's the thing; very bacterial situations create an alkaline one. Fungal situations tend toward acidity. And they both prefer the situation they create, and dislike the situation the other creates. And please don't ask me to to explain it because the answer will have to be scientific to the point where it makes my eyes cross. We still aren't sure if the soil goes alkaline because of the bacteria, or if bacteria just like alkaline soil so much they show up, and the converse diliemma still abounds around fungi.
Suffice to say that when I am telling you all to stop thinking like chemists about NPK and pH, this is why. When we get our soil to a reasonably balanced fungal/bacterial place, everything from nutrients to pH sorts itself out. And as we are finding in the first chapter of our book club selection, it doesn't matter what YOU think needs to be in the mix because the PLANTS do the real selecting anyway, so let's just use good compost and let them sort it out, right?
Toil, most of my experience in using tea has been commercially on lawns, and in those instances there really isn't any such thing as too many protozoa. The bacterial population is the surest control of the protist population, and I have yet to see a soil devoid of bacteria, even the most destitute chemically treated wastelands still have decent bacterial populations if they haven'y dried out completely. So AS is right, assuming a decent bacterial population is a safe thing to do...
You have to trust that Nature will balance out any tweaks you make to the ecosystem pretty quickly, as long as it isn't a chemical attack. I agree you can get a little boom and bust with really crazy numbers, and a lot of the bacteria in our compost are things we want to get into our lawns and gardens, not our protozoa, but that's another reason to call it at 24 hours of brewing and use your tea. But I have seen very protozoan teas actually green up a lawn visibly within an hour. And people ask me if this stuff works...
HG
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Destroying hyphae is not so much the issue because once hyphae are broken, they won't grow more anyway. It's spores we are trying to shift in tea. All hyphae tell us is we have a real good chance of finding spores with them...
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I didn't say protists are bad. That's like saying wolves are bad for a valley. Of course we need predators. But if all we have left (say after 72 hours of brewing) is fungi and protists, they could go on a feeding frenzy in the soil and poop out too much mineralized N at once.
This DEFINITELY means you want to avoid sunlight when applying your tea. 
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I gave it a dab of molasses on the tip of a toothpick and about 1/2 tsp of kelp meal.