Thanks. Interesting point that I might need to check out this winter.Your mention of the sail's age/use and three pictures showing the luff pretty eased brings to mind the possibility that 'easing the luff bolt rope' will result in better shape and control. 'Easing the luff bolt rope' is not the same as easing luff tension. In the last several months I've eased the luff bolt rope on 4 older mains and a jib, and the effect was substantial each time. Turns out bolt ropes shrink rapidly up to a point with age/use, such that (a) the rope tensions before full hoist, (b) tension on the halyard and/or Cunningham has less (possibly negligible) effect on draft position, and (c) the luff deveops myriad small wrinkles. Easing the luff bolt rope involves removing a little stitching at the tack and any reef points. It's a DIY thing but it seems most ask a sailmaker to do it.
I agree there’s lots of draft up there and the top always breaks first when I luff. But the cars are already pretty forward; definitely pulling more down than back.It looks like you could move the jib cars forward to me. Too much draft at the head compared to the foot for my boat for sure.
In the past when I tried pushing them even further forward it was hard to get any pull on the lower part of the sail at all.