They don't look nearly as bad as I expected.
Be aware that the MG and Shultz soils are REALLY similar in terms of how they react to additional feed- it's easy to over-do it, but actually your new growth looks perky and green so I'd hold off on giving liquid feed until you notice that they are hungry.
The pics appear to show plants that need to be watered. Do the pots feel light? If they do, the wilt may be nothing more serious than drying. Your conditions sound very reasonable.
There's no need to run peroxide at this point. If your pots have built in catch trays, make sure they have been removed, and if you still want to use the trays, at least put like a shim under there so the pot drains more freely. That's the best way to get oxygen to the root zone in soil.