Lot's of time those disease's are in the soil
and if the conditions are not met for growing
tomatoes, you just get the disease..
I have the Septoria leaf spot and it's about the same conditions as you have....
I have it down now to raised beds, good spacing between my plants
*over crowding doesn't allow good air circulation between the plants
And I put landscaped fabric under all the plants
***I have to dig you out the name of the kind I just found, works THE BEST!!! and that was my 5th brand to use...
***I only water at the base of the plant
, NO SPRAYING THE LEAVES, UNLESS BY RAIN AND DEW!
***I only water in the morning hours, (okay, it's been up to 11:30 when I'm done waterin' but it's still in the morning!)
***I NEVER touch the plants
when they are wet or my hands are wet..~passes on disease'~
***I snip off the leaves at the bottom, that have those dots, and BURN THEM!
I have more to say on this.. but it's midnight here, and I've had a whoppin' day..
I'll finish up on some of the things you posted about!!!