[BruceBruce1959]

You also have to keep in mind, the higher you go into the umbrella the less shooting circle you have to shoot in,
Example: if you go up 20' and look from left to right you'll see you have about 40 yards out from the base of your tree to shoot from accurately.

Now go up to 25' and you may only have 25 yards from the base of your tree to shoot in. I hope this explaination is understanbable...