i ran in the WH3 a lot last year and got a pair of 4's about a month ago and love them. i have the 2,3,4's and tried them on back to back and the 4 has the widest toe box of them all!!
did you change sizes? maybe I was in a smaller size.
the strap thing doesn't rub your pinkie toe?
WH3 was almost a perfect shoe for me. running, backpacking 3 days carrying 40-80lbs, tech ricky ST trails, flat fire roads.
i've been in 9.5s in the 3s and 4s and i think 10s in the 1 & 2s. i still have all the versions. i'll get a photo.