Never been to montreal. Only Toronto a few times. Your form looks good. You are missing due to strength. Block pulls are actually (counter-intuitively) better for starting strength not lockout strength. What you need to do is lots of conventional pulling or conventional deficit deadlifts. This will strengthen your back strength, which is your weak link when you miss. You should pull from a 8-10cm deficit for reps between 4-8 with each rep done from a dead stop. Do these a lot. Stiff leg deads are also a good way to add back/hamstring volume on top of that. Also done from a 8-10cm deficit.