That is a lot of sets compared to the examples I've seen in the literature about Westside BB.
Typically, you start with the bar and make very big jumps. Then around 50%, you start taking 10% jumps. Typically sets of 5. Then around 80%, take a triple. Single at 85%. 88-92% a single (basically a single you could hit even if you got zero sleep and haven't eaten in many hours), then another single at 94-97%, then if you have it in you, go for 98-105% depending on how you feel.
That's not hard set in stone and percentages are just recommendations and can change depending on how you feel, but I think it would be a good starting point. Make gradual adjustments either up or down on the warm up volume.
You're not trying to turn your warm up into extra training volume, just waking up your nerves to be prepared to take your 3 singles in the 90ish+ percent range.
Back down sets do some people good so I'd keep it if you like it and feel like it helps. But if you're having trouble recovering, don't be too hesitant about removing them.
There's my $0.02
edit: I just noticed there a fail up there. These shouldn't happen often. Maybe once or twice every 12 weeks. You don't get anything out of them and they eat up recovery a lot too.