Not sure what the problem is as I'm having pretty much the same results this year too.
I've got mine out in full sun now, and they are still very small.
I'll be planting them out also over the Memorial Day weekend.
Perhaps it would be a good idea to acclimate your's over this week to full sun also.
Hopefully, once planted out and the weather stays warm, they will begin to look as they did in previous years.
Good Luck!
Cathy

My tomatoes look like reagantrooper's in the May 20 post "Any ideas"

Leaf roll?

Fran

The miracle grow should help a lot. It sounds like its the first fertilizer those plants ever had. Peat pellets have no fertilizer and neither do germination mixes. I think that's why the plants are so tiny.

"I started them in peat pellets..."

As far as I'm concerned, there's your problem right there.

I was NEVER able to get a viable seedling with peat pellets.

Not one single time. Those things are horrible.

I start my seeds in 4' pots of Promix. I scatter about 20 seeds in each pot. When the first true leaves appear. I transfer each seedling to 6 packs of Promix. I transplant each up to the true leaves and water with Mirclegrow root boost, made specifically for transplants. They go back under the growlights until ready to harden off outdoors.
I would not use a tomato fertilizer on a tomato until it is well established in the garden.

I hope this helps. I've cured my tomatoe's yellowing by watering with a teaspoon of epsom salt dissolved in a quart of water. One time only. The stuff works wonders on rose bushes too.