Well, all I can say is that the exponential function has been wonderful for me, and my scores have beene improving since using it. I guess it is a function of getting used to it. The first impression is that the model isn't responsive, but you just have to learn to work with the different feel.
There have been a couple of models where I had to reduce the expo by shortening the links, but these were 1/2 a models with too small bellcranks. You need to learn how to tune in the total system, bellcrank size, pushrod link location on bellcrank and horn, line spacing at the handle, expo level and CG for a particular model design.
With all that said, there is no question why the "pros" stick with specific "numbers". To get a Nats competitive new configuration would take a lifetime of testing and experimentation. ( George Aldrich and Bob Palmer managed it, but times were simpler then. The bar is WAY higher now).
On the other hand I love getting good performance out of wierd designs, and beating the conventional boys (in advanced, not a prayer to do that in expert).
As far as quickly starting maneuvers is concerned, I judge at most of our contests, and even the Expert flyers suck at hitting the original entry point in consecutive maneuvers. Usually 5 to 10 foot error for the second and third loop bottoms. And none of them are flying an exponential handle, so that isn't the problem.
Brett, why don't you come on down to the Knights' Joust and show it how it is to be done? Love to have you show up! Bring the whole NW crew with you and wipe us out. We'd love to suffer. Some BBQ tri tip just might be your real reward. (Ask Bob Hunt) I have learned at the foot of the master, Warren Walker, zen master of the grill.