I haven't flown WB3 in a long time, however, I can tell there is not such thing as roll inertia or control delay in real life. It's common sense- the aerodynamic forces are dominant on the wing, and, when you move the ailerons, the flow adjust instantaneously. And, of course, most of the weight on the wing is placed as close to the root as possible, therefore the moment of inertia is small.
Even when flying at 50knots, in the slow flight regime (pilots know what I'm talking about), when the plane feels kinda mushy, there still is no such thing as roll delay or roll inertia.