I HIGHLY doubt, u'll get many extra customers for offering such a high end wax. I also doubt u'll be able to charge significantly more for a coat of a high end wax. I doubt that the wax would ever pay for itself.
90% of the shine in my opinion is from the surface preparation. A decent glaze adds as much wetness to the paint as any wax in my opinion. All the high end wax's require their "cleaner fluid" to not only clean the paint but add the wetness of a glaze.
I'd just keep doing what you are doing. There are other ways to move from the kid image. A professional leather binded book showcasing your work would be the first step. This will definitely impress customers and allow them to see other high end cars, excellent before and after pictures showing swirl removal is a must. The customer will instantly trust you with their car if they see cars worth twice as much as theirs being restored.
Get a T shirt made with your company name on it. Nothing says your serious then your own T shirt. Have business cards if you dont already have it, and pampflets made so you can pull one out when you discuss prices with customers. They can take these with them and call you back at a later date.
You cannot get more professional than that for a mobile detailer. That will get you more work than by offering a high end wax.