Everything works, shoot distribution is about genetics and auxin distribution.. I'm not saying it doesn't work, I'm sating that all that K is there for appearance sake, it does make a plant look vigourous and healthy, but in the end it will actually reduce the yield your plants could have had if they were grown well with better proportions..
To make an analogy its like a person who digs ditches during the day, and body builds as a hobby.. Sure the body building can let them mold their body to appear more proportionally Adonis like, but really they'd be more productive if they used that time/energy to dig more ditches..