i dont give my seedlings nutes for the first couple weeks, maybe this is your problem. they usually start turning a little yellow then i give them the first dose.
i tryed to give only water at first time but was the same, they just stop growing at that point when first true leaves apears, i ruin hundred seeds and still cant get ower seedling stage, only few roots comes out of tha biger rockwool cube ant stops growin maybe its like you said for owerwater. maybe its to much water holds in that cube its the only thing that i havent tryed yet,maby rockwool cube need to dry out a little
I use a seedling tray (enclosed) with another one inside with mesh to raise rockwool up a bit and just make sure the bottom of the tray has a little water in it.