Pizza, how are you powering the IC? I can spot a wire which you have connected to EN pin, right? But what about the 5V VCC at Pin37?
Pin9(ST) and the external capacitor connected to it is responsible for all kind of VID changes, which includes the transition from VBOOT to VID voltage. According to the DS(p.20) a 2.5μA current leads to VID load.
Edit: Why can't you raise voltage higher via the VR?
Using the VR, I can only tune up to 1.15v before the IC shuts off. Need to make VID adjustments to go higher. Try'n to understand the ST pin.