On my 300S, my first flight c/g was at 2-3/4" aft of the front of the wing tips. It proved to be very stable for the first few flights, so much so that I soon moved it aft about another 3/8" from the initial c/g of 2-3/4".

Knowing that the initial c/g was supposed to be at 2-1/2", I was a little concerned, but I had already set up and flown one of the 28% Edges and had determined that Tom had provided a starting c/g that just about anyone could successfully begin with. My thoughts at that time were that it was probable that he had done the same with the Extras. This proved to be quite true.

As it was, even at 2-3/4" the 300S "felt" like it was a little nose heavy for my taste on landings, and moving the c/g aft a smidge made it a lot better.

Without knowing how you fly, or like to fly, I still think you will be pleased with the handling of the plane at the C/G reference you now have. The 28% Extra 300s is an extremely easy plane to fly, and lands better than that if you can believe it. It's quite a "floater" on the landing approach, so don't drive it at speed for the runway as you may have done before with smaller aerobats or you will overrun both ends of the runway and still not touch the ground.

As to your original question about the digital servos, being noisy is normal for any digital. Some are noisier than others, though. Unlike the "analog" servos you have used in the past, digitals are always working when any weight or load has been applied to them. Just the weight of the control surface that the servo is connected to is enough for the servo to act against the weight of the surface to maintain the transmitter defined center position. Yes, the current draw at neutral will be slightly elevated from what you have had before, but it's no big deal. So my best advice here is to sit back and enjoy the sound of speed and precision like you have never experienced before!