That quick depressurization happened to me on my VTX 1800 when my front valve stem broke. I had installed a 90* on it to ease pressure checking and didn’t read the part about removing it afterwards. The side forces at speed cracked the valve stem. Fortunately I was doing about 30mph on a park road in the Everglades and had some friends with me. Bad feeling. Glad you didn’t crash and burn! Your comment comparing Dunlops to Metzelers is confusing. Did you mean Bridgestone?