Also check for differences in the twist angle in the fabric close to the starting point and further in the fabric. The handling of a tight twisted yarn during the warping process removes twist from the first part of every warp end. With the Forum samples we didn't weave past that first looser section before re-threading, so it will be interesting to see if the twist angle is different after the first half meter of weaving.
For the first time after the Forum, I'm going to weave something different from a plain weave. Eight shaft, four colours echo weave as a sampler.