I shoot open as well, and getting a good seal with over the ears was always challenging. Also, foamies never really stayed put in my right ear. I ended up having a set of custom silicone ear buds made with the passive noise filters. They are super comfortable for all day “major match” comfort and allow for easier conversation. When I am shooting or RO’ing an open shooter, I put on a pair of Sordin Pro X. They seal well around my eye pro, allow me to hear range commands, brings the concussion to a manageable level, and stops the “head rattle” you get from 9mm major with a comp. Just don’t make the mistake of forgetting the muffs when you walk to the line. Also, buying able to not have muffs all day is a lot more comfortable in the heat and humidity in the mid-Atlantic.