Watermelon (mystery bag seed)

This is my second grow attempt with these mystery seeds. (first-time grower). Had a ton of issues in the first round due to fungus gnats in the soil. I started from scratch 40 days ago with a bag of Pro Mix - Premium organic moisture mix and some brand new fabric pots. I only filled the pots halfway with soil, to begin with, but two days ago I pulled the plants out of the pots and filled in the extra. I started this grow off with only two of these Feit Electric 16W bulbs and picked up two more today. The plants are starting to get quite big for my growing space. I think I probably should have topped them sooner but I got cold feet after how badly the first run with these seeds went. Hard to take blades to a plant that's doing so well. I also only just started to do a bit of LST yesterday to try and even out the canopy. I have more work to do, ideally, I would like to have been able to use a trellis net. Maybe next time! I don't know too much about these seeds. I think they must be photoperiod and if I had to guess I think I would say these are Indica dominant. Two of the four seeds I planted came out a "bit" mutated. One more severely than the others as you can see in the pics. In the future, I would probably just pull that one out but since this is a first time grow for me I felt like keeping it to see how it developed, just out of curiosity. I've never seen a plant grow quite like this, with leaves curling up into spirals and looking so thin. Can't wait to see how the buds on this one develop (if it turns out to be female) I'm debating whether or not to do some defoliation on these suckers, just to get more light into some of the lower branches. Not much to do, but I think if I took out a few of the lower fan leaves it might help some of the lower branches develop better.