The top video explains what the correct way to dynamically test your lie angle on your irons and wedges. The bottom video explains why lie boards – LIE. Are your clubs fit this way? If not this is one of the factors you may have in ill fit golf clubs.
One of the reasons, I use True Length Technology or TLT is for the best performing playing length/lie angle correlation. Based on a math model there are 16 Series for adults and 10 Series for juniors. Every golfer fits in one of these TLT Series correctly.