There's a big thread on this in the training section. There are really only two authentic forces at work here. Lift and weight. The lift acts straight up perpendicular to the lateral axis. The weight always acts to the center of the earth. These forces do not line up in a turn, therefore you break them into components to understand the effects.
The force of lift is called total lift and it has vertical and horizontal components. Vertical fights weight, horizontal makes you change heading. The inertia of the aircraft, also known as centrifugal force reacts (not ACTS, but REacts... centrifugal force isnt really a force) equal and opposite to the horizontal component of lift in a coordinated turn. What the inertia, or centrifugal force, does is cause you to feel the weight of the plane in a different direction than the actual weight force is applied to. Still with me? The centrifugal force deflects the weight vector to the Load Factor vector. This is what you feel. It acts opposite to the total lift component and is equal to it while maintaining altitude in a turn. You feel the weight straight down through the seat, and so does the wings.
Positive G's occur when you stretch the load factor vector by adding more back pressure in the yoke. To maintain constant altitude, you would have to bank more. HCL has nothing to do with load factor... not directly anyway. HCL equals the inertia, which causes load factor to swing away from the weight force. The more HCL, the more bank, the more inertia to overcome, the more load factor, and thus the more back pressure you'll have to apply.
