LucasB95, It can never be emphasized enough: Don't spray unless you know precisely what you're spraying for, and use a product precisely designed for that particular issue, precisely according to instructions.
Even with that caveat, I'm not comfortable recommending you use any such products at this point, especially if you still have drainage problems. Based on what you described, it's like using paint to fix the cracks in the walls that are caused by a sinking foundation. The "cure" is fixing the foundation -- in your case, the soil.
You said
LucasB95 said: Nothing seems to be particularly "overrun" by bugs but the tomatoes and peppers have some yellowing and discoloration
Got Nitrogen burn
A little mildew and some browning on some of the melons and squash
:
I don't see what you're spraying for. A little mildew isn't a fungal infection; nitrogen burn, yellowing and discoloration aren't cured by insecticides. The algae you mentioned previously was caused by standing water.
"Weak" by your old farmer neighbor's standards doesn't mean benign. If something is chewing, figure out what it is and MAYBE use the insecticidal soap only, AS DIRECTED. Not the 3-in-1.
I know you want to save your plants, but there is an expression, "throwing good money after bad" that might just apply here. Send us photos, and we'll see if there is something else you can do to save some of your crops.
