Re: One hamstring tighter then the other
I think the other Dave gave you a very good answer. I'll just add that this may be a case of which came first, the chicken or the egg? In other words, is the uneven tight hamstring causing a scoliosis type of problem, in which case you'd need to figure out why one is tighter than the other. Or is the scoliosis causing the tight hamstring, in which case you'd need to figure out what is causing the scoliosis (if that's what it is) and what course of treatment would be appropriate.
Either way, you're going to need at least some basic x-rays. Without medical insurance, you might be able to go through you're local health department to be seen at least on a sliding scale, if not for free. You do want to get the ball rolling and nip this in the bud, if that's possible. At any rate, you don't want to let it just get worse and worse.
I wish you the best.