Injectors Pop Pressure
 

What would be the benefit if one increase the pop pressure on an injector from the stock setting?

No benefit. It will retard your timing. Rebuild them back to stock pressure.

If you're burning WVO, the key is heating the WVO to 180F*. At this temp, the grease behaves just like diesel. Thicker grease can be atomized with different nozzle applications, but you'll only get so much mojo out of thick WVO. You can thin it with diesel also, but heating is the real key IMO.