RE: razzle hover..
as tail heavy as you can stand it will help with hovering.
take the plane up, put at about 1/3-1/2 throttle, invert the plane , get it going straight and level, then take your fingers off the right stick.....if it flies straight and level without descent...then you are approaching a good 3d cg. if it falls, rearrange your electronics to enable a cg that is more tail heavy ...DON'T ADD WEIGHT !!...added extra weight is your enemy !