hmmm make sure you dont get any chemicals on the plants! its best not to use the insectaside. try a solution of soap and water, I will look for an exact recipe if you want, you need to find out whats eating them though because different pests need different cures, but the soap and water shit should work just make sure you dont use much soap (just alittle and i think you use lye soap) and spray the tops and bottoms of the leaves. that should work.
If there are no roots sticking out of the bottom of the pot you should be fine, and as for the streaching, it wont effect yeild or potancy directly but you want a strong thick stem to support the weight of the plant when it gets older. to small your plant could snap in half from its own weight. only the taller one looks bad to me. you might want to tie it to a stick or something for support.
Just make sure you get them in better light, you should be fine.