Rhizoctonia AND Botrytis? What am I doing wrong?

[RealKaseyGrant]

Hello again! I'm fighting something here, I'm not sure what it is or if it is multiple things.

So, I thought some of my phals had rhizoctonia. The root rot was aggressive and the leaf yellowing matched the symptoms in my research. I lost one but managed to save 3 others, I think.

Then I noticed my zygo and cycnodes getting yellow leaves. The phals and the zygo had been repotted recently, so that didn't really surprise me. The cycnodes was next to the zygo with leaves touching a bit. I quarantined all of them and did Physan drench while awaiting a systemic antifungal, which I got last night.

Then I noticed that my phrag had weird spots on its newly bloomed flower, which promptly proceeded to fall off this morning.

Now, it is still warm, like 80 degrees most of the day, in my orchid room. Maybe gets down to 68-75 at night if I don't open the door to cool the room. I have multiple fans going 24/7, and the humidity is @50%. I have multiple full spectrum + UV and IR grow lights that are synced to the actual sunrise and sunset. So, I don't understand what l'm doing wrong. Botrytis AND rhizoctonia? Really? 😭 Does anybody have any suggestions? I use Quantum Orchid for beneficial bacteria and mycorrhizae, too. I don't know. I'm lost. Any help is appreciated. TIA!