One key to stropping, aside from finding the "bite" angle (the angle where if you were going edge first it would cut the strop), is make sure you are not pushing or putting downward pressure on the blade. You really want to keep it light. too much pressure will have the same effect as dragging the edge at 90 degrees.
The leather is soft enough that it will wrap up past the edge and actually dull it.
For thicker heavier knives you will actually want to lift some so they are not resting full weight.
here is my ghetto strop bat. I broke a new belt, and cut it up. I use ghetto buffing compound from the hard ware store, but it works.
This is a v grind at this point. Just a bit of stropping with the loaded strop and it was hair popping sharp.
Angle does matter. If you have an obtuse angle and strop it up, it will get polished and shave hair well, even be hair popping sharp, but re-profiling the edge to a thinner angle then stropping will give you better tree topping results, but the edge will be more delicate, so just figure out what edge gives you a good balance between durability and slicing scary edge.
convexing an edge is another subject. If you use a strop for a while on the knife it will eventually become more convex.
Next I want to actually use quality leather and good quality compound.