My last two sentences are probably a bit overboard. I joined this forum looking for the perfect tie-in and one of my first views of something offering that to me changed shape in front of my eyes. It probably won't happen 1/100,000 times to anyone climbing, but it can and that is enough.
I have no idea what I did, that night, but I just recreated my pictures with a ring load, a couple good shakes and rough loading and unloading a few times.
It is pretty stable in the form in my pics though some parts that can't really go anywhere different are looser and more able to move than I am comfortable with for a tie-in. The tail is much less secure in the knots/positions that share the same topology (my pics being one such shape).
I definitely agree that a lot of (most?) TIB knots can suffer from lines shifting positions to make new forms.