My grow room is too dry if anything - RH around 25-35%.

Seedling mix that is too "fluffy" doesn't provide good support to seedlings, and they tend to flop. As you say, they will all be OK in the end. But the one bent-over seedling in your picture seems to be bent well above ground level.

Three of my nine Opalka look this way. The other varieties do not.

It may not matter. The way this weather has been, I may not be able to plant out until the solstice.

Lol re the solstice planting. Mother Nature is like, "Haha, Hairmetal4ever has some great looking tomatoes....How can I ruin his day?!"

Actually I’m sure we will have a week in April or May where we have a morning low of 32F, and three days later a high of 93.

I did an experiment tonight where I dug a couple up and replanted them deeper in the cell, pressing the medium up and forcing them straight in the process (plus they will root along the buried stem). If in a few days they seem to be ok and staying straight, I’ll do the rest.

My opalka and granadero seedlings do this every year -- they don't grow straight for the first couple of weeks. They usually lean towards their newest, largest leaf (easy to explain) but sometimes I'm at a loss why it's happening. The good news is that they all seem to outgrow it just fine.

They look better.

As they’re growing larger, there now seems to be some curling

They look like they need water and are wilting.

Instead of being too wet for several days, they now go from being watered, to being nearly dry within about 48 hours. The cells are full of roots and the plants are about 1/4” thick at the base, and 6” tall.

So I noticed that the mix was not wetting properly. I sat the tray in a tray of water for about an hour last night and they soaked it right up. Now that they’re fully moist, all but two appear essentially normal.

The two that look the worst today as far as rolling/curling are two different varieties - a San Marzano Redorta and an Opalka. Both are the two tallest and thickest plants of their variety, and are adjacent to one another, but I can’t determine anything else.

What sized cells are they in? They look like they need to be potted up and spread out so they have more space and are not competing for light.

4” wide.

They probably still need more water.

After a day of being moist the worst ones look no better.