It seems that (in my haphazard experience) the overall warptension usually seems tightest in the center of the loom, and it loosens toward the sides. I always assumed it was just me.
Like Leigh, when I have problems, I generally tend to assume that they are "just me." Implied in this, of course, is that nobody else has such a problem. In fact, nobody else has ever had such a problem!!! I wonder how many of us have a tendency to feel this way. Even after 8 years of weaving experience, I still do.
I have noticed the tendency in my warps tending to be looser on the sides than at the center. I wonder if this becomes more possible the wider the warp? Still, on the blanket warp which I was talking about, it was only the left side which was looser, not the right. I do have some ideas vis-a-vis knotting, mason twine and techniques for tensioning that I will try out on the next warp.
Also, Leigh goes on to say:
I have used Peggy's 2 stick header even when I haven't cut projects off the warp, and find that it really evens the tension out.
And this is one of the things I will try on the next warp. Usually just throwing those first shots of yarn to separate the warp ends also evens out the tension pretty well. I always find it interesting to see the various ends bubbling up and tightening in the process. And I always wonder, did I do that lousy of a job?! Anyway, if I really seem to be having problems, I will add Leigh's suggestion to my arsenal.