If it "likes to fly tail down" the tail will appear low relative to the wing in level flight(taking some consideration for the difference in heights of the horizontal stabilizer and wing from the fuselage centerline). I like them to fly slightly tail up.
If the tail is low for takeoff the plane won't be able to quickly rotate(wing wants to be level and stuffs the nose into the ground) and will basically have to achieve climbing speed before takeoff. Rotating the nosewheel off the ground decreases the effective drag also.
Standard cg usually runs from around 33% for nose heavy and stable to 40% for the really adventurous (inverted flat spins to the ground??). 35-37% is good for aerobatics -adjust to your taste and have fun!
Yes there is a little more to it but that will get you to a happier place.