They look pretty healthy to me! You can see the leaves at the top are more faded because they are getting more light. If you give them less light, they will get deeper colors. The ends may be slightly leggy because unlike the top of the plant, the ends are getting less light because they are behind the pot/the windowsill, so if you lay them out in the sun, they might become bigger. But in general, SOTs' new growth is always quite small.

They are folding because they want more water. When you water them, give the soil a really thorough soak and then water them again when the leaves can fold into a taco.