The reason your throttle feels dead coming off neutral in either direction Is because this is where you are directing the thrust for forward or reverse. The initial movement forward to the first detent just opens the reversing bucket up to what is called Thrust Directional Enhancer position. At this point the bucket is only partially open and some thrust is being directed down to help with directional control at low speed / thrust. If you try using the no wake mode to increase rpm / thrust in this position you will find you have more directional control, as the boats speed is increased. As you continue to push the throttle up the reversing bucket is fully opened, you are now in idle ahead and the reversing bucket is fully retracted and all thrust is going directly out the back and you will have more forward speed. Be sure to return engine rpm’s to idle with the no wake mode button before increasing engine speed further with the throttles.
Using the TDE position with the no wake mode will give you a lot more directional control at low thrust.
Hows your fuel gauge working now that you have burned a bit more fuel? On your connext screen there is a page where it will show fuel used.
@fatboyroy was having the same issue with the %fuel gauge, and he found as did I that the fuel used was far more accurate to determine fuel used / remaining.