| Rosin is a good thing, but if you put too much on it actually decreases your control rather than increases. To get a good sound you need not so much to press hard as to use your armweight to grab the string. It may also be a problem of possitioning or grip; which type of bow do you use and do you keep it straight, do you drop your shoulder etc? One thing that helped me a lot was praticing a lot of extreamly staccato notes, as in just the attack, both staying on the string (stopping the bow but not leaving the string) or off. When you learn to use the weight of your arm, with a pop in the wrists, and a relaxed motion, you realize that you don't have to dig in at all even to be very loud. I would suggest you look at your arm when you play the other strings and try and to use the same motion on the E string. You might need to lean the bass away from you so you can have the same access as you would on the other three strings.
Oh, and no, the action wouldn't have anything do do with it sound wise, but it may make it harder to use the correct technique because you have to move even further way from your natural state while holding the bass.
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Differences between strings 
