5 weeks 3days. When I had a little sprout break the surface.
I guess technically they're 5 weeks, but they're young still.
I wanna say it's a PH problem.
Just not sure where it's coming from though.
Steer manure is pretty neutral and won't affect the soil PH a whole lot.
Same for EWC, MG soil and I'm gonna assume the organic soil mix you bought as well.
I doubt one 1/4 strength feed of nutes is gonna throw anything out of whack.
Your water PH of 7.4 is close to neutral too, before you adjusted it.
Are your adjustments spot on? A little PH down goes a long way.
Steer manure, plus MG, plus organic soil, plus EWC ... the soil could be a little hot?
That could stunt a plant, though you'd probably see some other signs too like burnt tips.
I'd continue to water as you are and see if it gets worse or better.
I wouldn't feed any more nutes.
The plants are too small to have used up what's already in the soil.