I have the boa style closure on my Sidi's and really like it. Separate dials on top and bottom. After nearly 2 years of ownership, I just realized that I can pull on the wire of the lower part of the bottom one, in order to tighten the front of the shoe, whilst comparatively loosening the mid section over the top of the arch part of the foot. It has been a very minor niggle of mine for a short while as wanted that area tighter but was too much on the mid section. I have now found that the shoe can be held perfectly with the heel box and the lower boa doing all the work, even with the upper dial totally loose.
Perhaps that is actually how it is meant to be, and I was unaware, but hopefully this will help others with boa style systems maybe.
Perhaps that is actually how it is meant to be, and I was unaware, but hopefully this will help others with boa style systems maybe.