Downside to mainlining Early Girl tomato plants with caffeine??!!

For about six weeks or more, our experimental plot of five(5) surviving Early Girl tomato plants, fertilized by soil previously drenched by powerful doses of both robusta and arabica coffee grounds, mixed in turn with egg shells and orange peels over a period of up to two months or more, has shown tremendous growth and produced a lot of yellow blossoms, but zero tomatoes!

The five(5) plants are along a brick wall behind our half of the duplex.

They are exposed to strong afternoon sun, but 100% morning shade, and look pretty close to three feet tall with a healthy green hue to them.