Brake issue after lift

[BPNinAZ]

I had a buddy of mine at BIG O Tire install my 4 inch lift--which looks great--but when I got it back I had brake issues. He said it should firm up but I had to be very careful getting it home. It barely stops with a super soft pedal. They said they bled the brakes twice and then I bled them for two hours last night but no luck (gravity and pump). My buddy isn't a brake guy and doesn't know much past bleeding so I don't want to waste time and take it back to him.

I have multiple questions!! 1st question is...I've been doing research on the site and found there is switch on the combination valve that needs to be set. My brake light did come on during my bleeding sessions and I tried a C-clamp with no luck. Any good way to make sure this is in correct position?

2nd Q..I have a load level addition to the brake system in the rear. The installer made a couple brackets to retain this feature but can I bypass this? Is their air stuck in in this system?

I am at work but can add some pics later if that would help. Thanks