Spots on leaves... please help ID

[luvmykitty]

Good afternoon,
A few of my tomato plants have these symptoms in the following pics. The disease started on the bottom leaves and is working its way up the insides of the plants. Healthy green leaves get the spots, then turn yellow and “spottier”. The main stems on the bottom also are speckled but otherwise green. The green fruits are unaffected. I trimmed off the bad branches and sprayed with copper soap, which isn’t working too great so far- it’s still spreading. I’ve looked at dozens of online photos, sort of looks like septoria to me, but resembles some photos of bacterial spot or speck. Any thoughts on what this could be? And the best way to treat it?

Thank you.