Those flex connectors don't require tape. They have a rubber seal and only need finger tight plus a quarter turn or so. It's possible the tape is preventing it from going far enough to hit the rubber seal. OR you cranked it too tight and effed up the seal. Take tape off. Look at rubber o ring inside. If it looks ok install properly( no tape) and check. If you get any drips carefully tighten more a bit at a time. If it still leaks go buy another flex hose. 5 year apprentice ship to learn how to attach braided lines LOL