There's no way you should be having any difficulty at this point. You're only maybe 2 weeks in if my math is correct.
I've been reading this thread and it's already been said to death. Don't use heavy weights right now! There shouldnt be any comments about not being able to get a full lock out, or these are getting heavy and tough. Bump it down to a lower weight. You shouldn't be saying it's heavy or tough for a few weeks.
If you can't get full lockout with deads, then it's too much weight. I would drop that weight and work on form with a weight you can at least handle relatively easily.
This program is the tortoise and the hare. Slow and pace will win the race, but right now you're trying to speed along like the f'in rabbit. The tortoise won remember
