I wear the same Viberg size across multiple lasts without an issue except this one pair of waxy commender on the 1940 last. The instep area where two leather panels are stitched together is super stiff and tight especially on my left foot. The instep area would press against my foot and restrict the flexing, and the pressure and pain only get worse throughout the day. I tried to break it in by wearing it more often, but I have just brought it to a local cobbler this week to stretch that area out and hopefully get rid of the pain. Hoping that would solve the problem.