Hi Bryan, I think your tomatoes are doing fine. They seem pretty young yet. Some varieties just grow like that till they’re older. Maybe just give them some time. Possibly they might be reacting a bit to too long or too close lights? And possibly heavy soil. When I’ve had seedlings look somewhat like yours (leaves not spreading out) I think it was due to too heavy soil. The next year I added more sharp sand to my mix (I make my own) and that helped. But every year is different and different tomatoes grow differently so it’s hard to say. As others have mentioned, when you transplant maybe consider adding some vermiculite/perlite/sharp sand type stuff to the mix? Or try some other mix?
My plants often get watered from the top even when started in pots, just because it’s easier and I have a lot of plants. When they’re transplanted it’s into flats in the greenhouse and there they always get watered from the top. And it isn’t very warm especially in their early days (45-70) so they’re always on the purple side. They get more light as the days get longer.
I don’t let them dry out completely, just the top of the soil before watering. They’re in natural light maybe 12 hrs, though on cloudy overcast days I supplement with LED lights (now that I have them - never did before and I still had good plants). And I have strong healthy plants by the time it’s ready to transplant outside. I think they’re pretty hardy souls, and seem fairly forgiving. I grow all early maturing varieties. Maybe longer season types need warmer temps? But it sounds like yours are plenty warm.
My greenhouse, by nature of walking in and out and vents, has a pretty good amount of air circulation but it also has a couple of small fans when the temp gets into the 60’s and I think that helps a lot for healthy plants. Don’t know if that might be something you could add (or need).
Hopefully your plants will grow up and strong the way you want them to as they mature. Sue