Very well done. I'd do this only if the lean were right on target - not likely, that. So, maybe remove branches on the main cut side to shift C of G toward the gap. Plus, when its this tight, guy the tree like sailboat mast-stays with tensioned, non-stretch line. In this situation wedges alone are not precise enough on their own. Of course, air should be still, or be gentle in the intended direction. Some luck wouldn't hurt. GIF gives no detail. I'd like to read a report on the strategy in this case.