I got this from the VMP site. Seems like you may be boosting more than you thought since the 75mm shows as a 13psi pulley.
85mm - 9psi
82mm – 10psi
79mm – 11-12psi - (72# Injectors minimum requirement at this level)
75mm – 13psi - (72# Injectors minimum requirement at this level)
72mm – 14psi - (72# Injectors minimum requirement at this level)
69mm – 15psi - (72# Injectors minimum requirement at this level)
66mm - 16psi - (8-rib conversion required)
63mm - 17psi - (8-rib conversion required)
85mm - 9psi
82mm – 10psi
79mm – 11-12psi - (72# Injectors minimum requirement at this level)
75mm – 13psi - (72# Injectors minimum requirement at this level)
72mm – 14psi - (72# Injectors minimum requirement at this level)
69mm – 15psi - (72# Injectors minimum requirement at this level)
66mm - 16psi - (8-rib conversion required)
63mm - 17psi - (8-rib conversion required)