Glad to see an atty change helped you out. You have to remember that atty's and batteries are disposable. 4 months is a good run. If you mix flavors on your atomizers, things are going to start tasting different. Some flavors really like to hang around.
Also like everyone said, adding some VG will give you more vapor, but VG provides less throat hit. A lot of reviewers don't inhale I've noticed, or just lightly inhale. I've also noticed that if I turn my cam on and take a drag, it looks like I get a lot more vapor on cam.