Unfortunately, there is no way to speed them up when the helicopter is on the table. They are always going to be slow to return to center, and here's why. You gave an input to the gyro to move the helicopter a certain number of degrees, but the helicopter didn't move. Because of this, it's going ot hold some pitch. However, the cyclic gyros in the gyro are Rate mode only and not heading hold so they will not hold their position like the tail and will slowly return to center.
If by chance you are trying to set pitch or something, this needs to be done in DIR mode.
Hope this helps.