The speed day weight makes zero sense to me. You're working within 90% of your max effort almost constantly... It's no wonder you are failing reps. You shouldn't really be failing reps on competition bench day... But on speed day...? Failing a rep on speed day shouldn't even be a consideration.
Speed work at your level didn't really add up to me either but I guess that is more of an opinion than a law of powerlifting. The weights you're using are just too heavy all around in my opinion... It's almost equivalent to maxing out constantly. Maybe I need to see last month to see if this was just the top end of a progressive overload... The speed work weight still wouldn't make any sense to me no matter where you are in the programming.
The % of your back down sets is about right... Would probably be better to be dropping more off just considering the fact you're starting out so heavy in relation to your 1rm... Which is around 270lbs or so.
@Perrin Aybara, what do you think of this?