This is the same scarf. At the left, it’s fresh off the needles. On the right, it’s been through this torture:
All lace benefits from a savage blocking. Is your Wingspan looking flabby? It’s probably not your knitting technique. Try blocking it and see.
For the record, I used my visually horrific checked sheet and damp-blocked my finished Lattice Wingspan. First I dampened the thing and squeezed it out gently (no wringing). I patted the center curve into shape and pinned it first. Then I used a minimal number of pins – just one at each point – to pull the points out from the center. Finally, I let it dry overnight.
The ends? I don’t darn in ends until after I’ve blocked. Especially on lace. Finishing off the end may introduce a small area that does not stretch like the rest of the piece. Better to let them hang, then deal with them after blocking is over.