The fact that you are not faceplanting when you do your scoop tells me that you aren't even close. Throwing an air trick is a total commitment. There is no "little bit" to it. If you are edging as hard as you can when you scoop then you are probably tapped out on your edge and can't put anymore into it.
Try edging about 50%. Then when you want to throw the trick, lay into your edge 110% while carving your board away from the cable into a sharp hook. Look over your lead shoulder and hang on with a death grip. What happens next is automatic... the water will grab the board, stretch the cable, then the rebound will yank you up and forward while the water throws your board into the air behind you. Looking towards your shoulder will throw a roll, which is much kinder on the fall than a raley if you don't throw it hard enough.