I think I left a comment on that video the first time I saw it. If the floats are not doing their job why not just replace them. I am not a fan of carb mods like this. Jetting ... fine, but backyard rigging is not a good idea.
Harry, I agree adding the springs is not optimum. But it was determined back when MoodyValk was doing this that the problem was the springs in the float needles were wearing out. BonS did some thorough investigating on this and found new float needles cured the issue. But new floats in addition sure couldn't hurt.