The excess salt is not likely to harm your fat loss efforts, and it seems like your blood pressure is naturally low. Sodium is a concern for people with diabetes and heart disease because it retains fluid and usually raises blood pressure. If you're still concerned about sodium switch from high-processed deli meats (usually cured or otherwise preserved to increase shelf life) to minimally-handled meat. If you're using it in sandwiches get uncured bacon or chicken breasts, which conveniently fit inside a sandwich. I also get my canned tuna in olive oil instead of brine, that keeps my salt total down as well.