Yes sir, i'm surprised i do not see people using snatch blocks often. Most of them rely on speed instead of slow controlled power on the right spots.
Using a snatch block will double your winch power.
In the picture i drew, not only it doubles the power of the winch but it also splits the load between the rig and the tree instead of all of it being on the rig. This makes it much safer than strapping the back end of the rig to a tree and pulling the frame apart from both sides.