9 Week old plants – not sure why they’re so small – salvageable?

I planted on Feb. 8th. This is my first time growing indoors apart from some herbs last summer so I am a total noob.

I am doing this in my basement that has a crawl space access a few feet away but the furnace is just a few feet away as well. The table seems to have been consistently in the lower 60's.

Some germinated very quickly within days, some waited until i learned to leave the fan off for the soil temps to be consistent and warm so some took weeks to germinate. My first ones up however were still some of my smallest at up-potting so I'm lost.

I've had two VIPARSPECTRA P1000 LED grow lights positioned about a foot and a half or so above the plants since germination; most of the time they were at about 80-90% brightness – I started at full bright and had a lot of initial leaf curling and some discoloration. In the last week or so I've turned them up to full bright and after up-potting raised them another 6 inches or so.

I've had a fan running on them, on low from about 4ft away, 90% of the time while lights are on, which run from about 6:30am to 10:30pm. Once in awhile on medium for a day. Once in awhile I turn it off for a day or two.

I've only fertilized lightly twice as I was spooked of overdoing it and wasn't sure they were ready. I'd mixed just a teaspoon or so of miracle grow liquid all purpose per gallon.

I was watering the pods what I expect to be told was too often. I bottom watered only but had to add about 3/8ish of an inch of water about every 3 days or the pods would get crumbly-dry, due largely to the fan. I tried stretching water early and had a few plants wither so didn't fool with the strategy further. Tried leaving the fan off more and got surface mold on some pods so kept the fan running and that mitigated that aspect.

I just up-potted this weekend and had maybe a half dozen getting rootbound and a half dozen where they barely held the soil together and a couple whose pods broke in half while transplanting. The rest seemed ready or ready-ish.

I wondered if that bottom layer of soil constantly being wet deterred roots from going all the way down, or maybe encouraged rotting off once they did, but other than that I'm guessless. Only a handful of pods had roots protruding or wrapping the soil all the way down. Several pods left a 1/2" of muddy soil in the bottom when I popped the plants out.

Low temps in my area are still dipping into the 40's at night once a week or so, and my plan was to wait until the lows stayed in the 60's consistently before transplanting to my in-ground garden. But that's only going to be at most a month.

With my plants basically still being large seedlings… are they a total loss already? I'm trying to decide if I need to switch into buying mode for everything – not just the species I'm currently lower than I want to be on. Thanks for reading, any help appreciated.