^^^NO, the Form 4 is not a title document. It is a tax document saying you are allowed to own a suppressor but it does nothing to actually confer ownership on you. If you are using a trust, you don't have to retitle the silencer to the trust, simply use a signed assignment of property document.
It's really not a big deal. You only have to charge it every 2-3 mags. I just shoot 3cc of water right down the barrel with the slide locked back, works like a charm. You learn very quickly how much water to use - you only get splattered if you overfill it.Some people try to get around the problem by filling them up with water or wire pulling gel. While it works to some degree, it also makes a mess with back splatter. Plus it is not terribly convenient to "recharge" the wet solution into the silencer after every mag.