ok, have just read your post that says you don't need to repitch it to dry it out.
okey dokey
if it's well used and loved then it's not a problem
but, when you wash a pair of jeans, even on cold, they shrink a bit, well they get tight, this is all fine as you can do some squat thrusts and stretch them out a bit, no worries.
With a canvas with sig it's like a giant bag, one into which you are fitting a VERY tight fitting pole. When I put the central pole up in ours it really takes some effort to pull it up into position. This is as it should be as it needs to be tight and snug.
If I tried to do this with a few mms of tigtness from the canvas all round, well I think I would be either
a) unable to do it
b) at great risk of tearing a hole in the ground sheet with the metal foot of the central pole.
Go ask on ukcs. It's a contentious issue, and can be rectified with re-wetting it and stretching it out into shape by re -tensioning the guys, but that would be a shiester of a job, really it would.
I have done my research on this