The yamaha controls on mine have a three buttons for tilt - one is on the port lever where your thumb goes to trim both engines at the same time. And then down on the mount part, theres two individual ones to trim the engines independently.
I used to find myself pushing one throttle more than the other when I first started with it - but after a while you get used to it and if they come out of sync you can feel it in your hand easily and sort it out.
I just love the feeling of being at stand still or pootling along at 6knots and then throwing both throttles forward - the boat leaps out of the water and goes like stink! The sound is pretty good too
My boat will be on the water again soon if you wanted to have a play at some point?