Transom height

[jsheff]

Hello, New 20' SF owner. I am in the process of replacing the transom. I am planning on keeping the 20" shaft 150 Evinrude. I have read on here where some of you guys have raised your transom 2" to 2 3/4". How does this affect the performance of the boat, by raising the motor? I was also looking at installing a Bob's 10" set back bracket, and raising the transom 4" to 6". Has anyone had any experience with this? Thanks for your help.