Hey Eric. By that notion you'd take the waist width and subtract about 3mm, so in a perfect world you'd need a 102mm wide skin. The 100mm is the closest to that, but you may end up with some side hilling issues because there'd be a lot of edge exposed. The 120mm is for sure my preferred width in this scenario though.
Hey Mmullen! Not sure if it changes things or not, but these shims are made by B&D. Not sure exactly what kind of plastic these are made of, but they're sturdy. Weights vary a lot, but I weighed the most common shim we sell, the 6.4mm Classic, and they are about 30g per side.
Hey James! Yup, you have to rotate them. Flat, +1, +2, and ski mode via the volcanoes. The volcano is made of plastic, but it feels like the kind of plastic that you'd want to use to build a tank. Feels very solid. Dare I say, heavy duty?
Hey Erik! Not sure if it's actually been done before but I've had this talk multiple times, including with myself. The forward lean isn't quite where I want it to be either. A less permanent (and potentially warranty voiding) solution would be to put some foam on the back of the cuff of the liner to just bump your lower leg a bit further forward. We've done that many times on these boots before to account for tiny calves or not enough forward lean.