Michael, your pull-pull setup shows exactly what we're talking about. Your rudder doesn't know or care what the spacing is on your servo arms, it only sees the spacing on the WIDE TILLER bar that you use. Like my example, your tiller bar is "wider than the rudder pushrod pivot attaching points", and this gives the increased travel. The rudder knows that it's being moved by something that's longer than its own horns, but neither it nor the cables would realize a difference if it were a 3" tiller bar, or a 3" servo control arm attached directly to the servo. The ratio is the same, and if the servo arm's holes lined up straight like the tiller bar's holes do, any variance in slack (or lack thereof) would be identical. I'd use a tiller bar if I were concerned about the loads that the servo bearing see. Since this is a relatively small load only requiring a single servo, I'd feel the servo's bearings would be able to handle that without stress.

I'm not trying to argue, your hangar is MUCH larger than mine, you probably have much more experience than I, but I do know that I want my cables tight enough to negate play while the surface is centered (and minimize flutter possibilities). Any minor slack that occurs when the surface is moved off center doesn't concern me because IMHO, flutter won't occur if there is pressure on one side of the surface (as there is when the surface is deflected). I'd be more concerned about the cable getting tighter, rather than looser.