Is your vault on the steps fluid, fast, or plain old fun? If so, it really doesn't matter what you call it or if it's the best way to train. Enjoy it, and for all you know, you might need that movement some day, whatever it is.
If you want to practice a traditional monkey-vault, I recommend using an obstacle that is between your belly-button and sternum in height. It should be vertical and have a large flat top (see below) so you don't drop into a faceplant if you accidentally hook your feet.
*good* *bad*
\0
\0/ ____(_ \0/ _
| | |\ | || (/
/ \ __| |__ /\ _||_ /0
* <-- your broken tooth