I've got a week old seedling (in hydro) just now pushing up its first node - mine are typically ready for transplant in week 3, and your roots will wrap around that cup pretty well (thats rootbound) you don't want that, just close to it, I'd say give them another week in those cups.

Notice how the amount of foliage has doubled just in the past few days? The leaves are catching up with the roots now. So leave them to catch up for a little bit longer, remember the larger the leaves are, the more light they can convert into energy thus making bigger, stronger, and longer roots. The bigger the root system, the larger the plant can grow

So yeah, give the veg at least few more days to expand, I'm sure in a full week you'll have at least 4 nodes on there at the current rate. Transplanting now only encourages the roots to seek out more space, instead of more energy on the leaves

So far so good, and don't worry, everyone looses seedlings first starting out!

OH and just saw your post about the soil -

keep them in the coco/perlite, if you wanna mix in the FFOF with the coco/perlite that's fine, just keep it under 40% (or to taste) but I'd keep it under 40. And remember not to use that on the seedlings until they're put into veg. But keep using the coco and the perlite, the coco holds great moisture, and the perlite adds good air - don't change either. the ONLY benefit to the soil is the added nutes, and we've already seen the damage too much nutes can cause, right?