Beer gas issues

Afternoon All, so I’ve lurked around and read around trying to figure this out hoping someone can help clear this up.

I’ve got a edgestar kegerator, one 5 gallon thing of cold brew on nitro (runs great), one 5 gallon thing of porter, hooked to an external beer gas cylinder. running 22 psi per the brewery I got the beer from. Running 20’ of line through a stout pour, roughly 35-38 degrees.

it comes out nothing but foam as seen in the picture. it will dissipate after about 3-5 minutes but it’s only a half pour then. Any advice on how to solve this? I’ve watched them pour this in the taproom and understand there will be some foam and cascade but not to this level