You will find that a tail heavy airplane is hard to control. The more tail heavy the worse the control will be.
ok so you add fuel to balance the airplane, as you burn off fuel you fly to an off balance condition.
now a nose heavy airplane is easier to fly, it won't want to slow down on approach, nor will it want to flair.
as you burn off fuel you burn to a balanced condition.
you may find you like a slightly off balance aircraft depending on how you fly.
the way I like to check CG is to balance the aircraft per the instructions. Then fly a bit then put the airplane in a 45 degree up line, full throttle, roll inverted and let go of the sticks. You want the airplane to continue at 45 degrees. If it climbs your tail heavy if it dives your nose heavy.
Balance the airplane to level and go fly adjust from there