(First 2 photos show my struggling plants and second 2 are my huge healthy sun golds right next to them.)

This is long, but I wanted to include as much detail as possible to hopefully get some help:

Zone 10a, Bay Area, CA, 
2x6x2 raised bed on top of concrete patio. Full sun, in front of a south-facing fence. 
Soil has been used to grow fairly successful tomatoes the past few years, amended with EB stone potting soil and soil booster.
Right before transplanting nursery-bought starts, fertilized with organic granular 4-5-3 fertilizer.
Transplanted 3 starts (Sun Gold, New Girl, Hawaiin Pineapple) in late April.
A few weeks later added 0-10-10 ultra bloom organic fertilizer, a layer of compost and a layer of straw. 
Watered deeply one to two times per week (I watered less than in past years, due to feeling like I had been overwatering, no negative results in past years just wasting water maybe, and the soil seemed to retain moisture well enough, maybe this year I didn’t watered frequently enough).
The weather has been typical Bay Area mild, ranging from high 60’s to high 70’s most days with low humidity. 

All 3 plants seemed healthy and grew well to start. They all showed signs of early blight fairly early which I managed by pruning affected leaves but continued to affect them. At some point though, the New Girl (a hybrid variant of Early Girl) and the Hawaiin pineapple really started to slow down in terms of growth. Growth slowed to a crawl and almost seemed like it might stop entirely. There were some suckers that I had let grow that grew a few inched and just completely stopped growing. I got plenty of flowers per flower cluster but aside from the lowest flower cluster on the plant, barely any fruit set. For the Hawaiin Pineapple, not a single fruit has set aside from the first fruit cluster. For the New Girl, I do have a few tomatoes above the first fruit cluster, but the vast majority have not set. I don’t do it all the time, but I hand pollinated plenty of those flowers with an electric toothbrush and fruit still seems to not have set. The flowers have just stayed there and eventually look like they are drying up and dying. 

I have always had trouble with fruit set on heirlooms, but in past years would still get some fruit production throughout the season. For slicer hybrids like the New Girl, I’ve typically had a lot of success. I planted Early Girl in the same spot last year and had tons of tomatoes.

What’s strange is that while my two larger tomato plants are struggling, my Sun Golds are great. These are the biggest Sun Golds I have ever had. They are huge. Clusters have a ton of flowers and fruit is setting fine. Of course a cherry like sun gold tends to be more robust and productive than others, but the contrast is very stark between the sun gold and these neighboring two plants. 

I really want to understand what has gone wrong here so it doesn’t happen again. I have only been growing tomatoes for 4 seasons and don’t have a good sense how to tell what’s wrong with my plants. My two theories are too much phosphorous from the 0-10-10 fertilizer, which I’ve read can inhibit nitrogen and other nutrient absorption and cause stunted growth, or underwatering. My plants don’t often look super underwatered, but I have watered less frequently this year than in past years. They did so well in past years I thought I could water but less frequently, but maybe I’m wrong. 

As far as nutrient deficiencies go, there are no off colors on the leaves. No yellow; no purple; etc.. Overall the foliage does look a bit sparse and small. The earliest lower leaves when the plants were growing fast got big and leafy, but now the leaves that are left do seem small, but green.  The leaves seem a little on the brittle side too. 

I’ve included photos of the struggling plants as well as my very healthily producing Sun Gold. 

TL;DR
My Sun Gold is producing great fruit but my larger tomato plants are setting very little fruit and growing very, very slowly? Underwatering? Too much phosphorous? Something else?




Almost no fruit set and slowed growth. Please help me diagnose the issue