This maybe the most foolproof way to level your transducers that I have read so far. This may help others so I wanted to make it a post. I was reading and CatFan replied to a post and this is the way he explained to level a transducer:

" To get your transducerlevel on the water, take a level and a handful of pennies out in the boat with you. With the boat at a slow idle the way you want to scan, put the level on the deck someplace and shim the back by stacking pennies until it reads level. Count the pennies, and when you get home put the level and pennies back in the boat where they were on the water. Crank the tongue jack until you center the bubble and your boat is sitting just like it does when you are idling. Now you can level your transducer and it will be right when you get on the lake"

I think Catfan was on to something here because when the boat is out of the water there is no way to know how it sets in the water. Thanks for your post CatFan and I hope this helps others like it did me.