Ignitron 1.8T boost control setup

Hi all, I am just starting to set up boost control on my 1.8T 20v engine and after watching the boost control course it was recommended to initially set it up in open loop then switch to closed and use PID to fine tune it. First question is that i am running a hybrid k04 turbo fitted with a 15psi actuator, will this require a higher duty cycle to acheive the same boost level than the original actuator which i believe is around 7psi? Second question- when i have my basic boost control settings in my open loop table, do i just copy this across to the closed loop table?

thanks