desided on the procomp 6 inch

but i do have some questions about it. i am going with the stage one and was considering upgrading the front shocks with billi 5100 since the lift kit doesnt come with front shocks. now my main problem is one of my friends installed a 6 inch on his tacoma and his leaf pac started to sag, so the way i figured i would prevent this was to put a add-a-leaf in the rear in addition to the lift block. what yall think about this??