I've read in a magazine that we need to make a perfect "T" with the spine and the shoulders.
What does it change if i'm not doind a perfect "T"?
Consistancy, bone/muscle alignment (this could have a real effect on follow through).This also includes head poistion (which also needs to be consistant).
Other possible inconstancies include torque andanchor. I'm assuming you use a compound, so your eye/sight picture could be inconsistant shooting level/down/upward angles.
Keeping the "t" will keep things consistant.
Another way to shoot downwards instead or along with bending at the waist includes dropping the front knee. Bending at the waist may have an effect on weight distribution FWIW.