Has anyone here used this line of fertilizers? Sounds great on
paper...organic, fish, seaweed, etc.....but with a 2-3-1 or 2-4-1 analysis
is it strong enough to improve the yield of tomatoes, cukes, peppers?

Most organic fertilizers will have that analysis or lower.

In some cases that might mean you need to be applying more of them
(that's especially true for something like composted leaves). Which
is not a problem if you think in terms of adding to the organic matter
in the soil, as well as just hydroponic-style infusion of nutrients.

In other cases, maybe you don't really need lots of fertilizer. Other
organic practices are all about keeping as much fertility in the soil
as you can, rather than constantly needing to replenish it.