You're training them out really nicely!
Not sure from the pix, but have you cleared the undergrowth? Just in case you haven't, nows the time to have that done so they don't waste energy growing larf. There may be the one or other superfluous budsite you want to remove, so it may lighten up those middles you say are getting too dense.
As for the leaves, not sure. I do have distorted leaves but you can see it's from them bumping into the closet walls or from getting stuck halfways in a hole of the screen. So unseen, I'd say if you can't track the distortions back to such obstacles, yeah somethings awry. Just thinking along here...