Using a regular barbeque regulator is an issue. They will usually run at only a couple psi(or only 1 psi). This regulator, which is similar to the one I use, is adjustable and can go up to 30 psi. You would usually expect to be using ~15-30psi.

This heat shown in the photo, in the middle of the burner indicates low pressure because the flame is burning inside the burner. The flame should be outside of the burner even sometimes separated a short distance in front of the burner.

I would expect that replacing the regulator would fix your issue.

I picked up this one on Amazon:

https://www.amazon.com/dp/B07GRFTR4S/ref=cm_sw_r_cp_apap_6jXR5bWtX9I2l

It lets you adjust the pressure as well. I was surprised how little pressure it needed to get the flames really cranking. Somewhere around 3 - 4 psi seems to be plenty. Too high and it starts to blow out the flame toward the back of each burner.