Oodle laddle laddle- Minor Mambo, Chorus 4

I'm working on Minor Mambo, Chorus 4. I'm getting the "oodle laddle laddle" up to speed. (Probably at 70% or so, right now...)

On the IV, there's an oodle laddle 4' 3 2 (pull) 2. 

What is your embouchure over the IV chord? Are you puckering the entire thing? I'm trying to switch to tongue block for the 4' 3 2 (pull) 2 part, and it's a tough switch at speed.