Without knowing the heat load calculation or what was installed it’s obviously all guesses. But the fact that temps are easily reaching 40+ or 105+, no AC is going to transfer the heat from your house to the outdoors. It’s basic science.
Air conditioners aren’t actually cooling your house, but instead it’s relocating heat. So if it’s too hot outside, it won’t do anything. heat transfer can only continue until the two objects (condenser outside and the ambient air) have reached thermal equilibrium and are at the same temperature. Once they balance out, it won’t do anything.
Infact, getting MORE BTUs on your unit is actually a bad thing since it won’t have time to dehumidify your house. This will lead to short cycling of the AC (it’ll turn on and off a lot) and you never get cooling. The amount of homeowners that demanded bigger sizes units only to get pissed it’s worse is astounding.
The indoor gardening also is TERRIBLE for air conditioners since your feeding so much moisture in the air.