Strange leaves

I'm on week 3 of my soil grow in ocean forest under a 600w mh in a 4x4x6.5' tent. I'm starting my fox farm trio sometime this week but I'm looking for some help with a couple plants. All together I have 4. One night I left the light a little too close and I think might've burned a few leaves and they are now a weird shape. I figured I should do some pruning and clip them off but I need a second opinion.

The other problem I'm having is with a funny looking runt plant. It's growing way slower and looks a little spotty. I was hoping the nutes could get it up to speed but I'm worried its not ready due to stunted growth. What do you think?

below are pics of the funny leaves, the runt, and a good plant for comparison. Sorry about the light I had to snap the pics in a hurry before work.

You can cut off just the burned part of the leaf and not take the whole leaf. This is only on my second grow but I'v had a small plant in both grows. I don't know why but they never came out of it and stayed small to the end. I tryed root builder and more nutes I watered from the top ( my system waters from the bottom) to make sure it was getting the roots. They went the whole time and just stayed small. So I don't know why some stay small and this could have been alot shorter post. match

other than the heat damage they look healthy, leave them alone to grow, maybe water the smallest plant less than the others