If the FaceCut, comes back far enough for the resulting hinge pivot back further than the CG/tcg; then logically, without other forces acting; the tree will fall into the face.
Wedging can help place the CG out past this pivot by lifting if slight backlean; or secure against other forces (wind, miscalculation etc.). Wedging can also force the hinge stronger by pressurizing hinge during folding. The gravity of the tree will force the hinge to 'X' strength; the extra tension of wedge, will like force hinge stronger like a bigger tree would. Then, tree lifts off of wedge, and pressure stops (from wedge), so now only tree pressure on the forced stronger hinge.
Bringing Facecut in further, helps to fall to Face as said.
Slanting BackCut downwards and wedging, reduces the arching motion, and thereby reduces the leverage that way. So it takes more power for the same effect, but the stump side is slanted on BackCut then too; this weakens the 'back stop' that more power must be applied to for the same effect!
Wedging can help place the CG out past this pivot by lifting if slight backlean; or secure against other forces (wind, miscalculation etc.). Wedging can also force the hinge stronger by pressurizing hinge during folding. The gravity of the tree will force the hinge to 'X' strength; the extra tension of wedge, will like force hinge stronger like a bigger tree would. Then, tree lifts off of wedge, and pressure stops (from wedge), so now only tree pressure on the forced stronger hinge.
Bringing Facecut in further, helps to fall to Face as said.
Slanting BackCut downwards and wedging, reduces the arching motion, and thereby reduces the leverage that way. So it takes more power for the same effect, but the stump side is slanted on BackCut then too; this weakens the 'back stop' that more power must be applied to for the same effect!