I've been making margaritas and I've found that, unlike fancy bar/restaraunt bought margaritas, my margaritas come out more like a liquid drink with shaved ice sitting in it than a mixture. I have a Margarittaville mixer for proper shaved ice, but the final drink lacks the same thickness I'm used to in a margarita; the exception being strawberry margaritas. With (lots of) real strawberries the drink comes out much thicker and smoother to drink.
Is there some ingredient that can thicken the mix for a smoother drink? Generally I use tequila, triple sec, agave nectar and then either a mix, strawberries, limeade or whatever for flavor.
If the restaurant or bar is using a margarita mix, they frequently contain additional syrups and stabilizing gums or starches which add body to the drinks. It could also be that the high powered blenders frequently used in bars will be better at creating a smoother and thicker texture, or a more 'emulsified' slush.
If you want to try making it thicker at home, the agave nectar is a good start. You could also try adding very small amounts of food gums, like guar gum or gum arabic. It may also help to chill all of your ingredients thoroughly before blending to keep it as frozen as possible.
Just add more ice. I was a bartender for years.
Don't use guar gum.
If it's too soupy then add more ice a few cubes at a time. I use blenders and have never used a margaritaVille mixer so that might be the issue.
Most restaurants/bars use a special machine for frozen margaritas; blenders are too noisy and too small-scale if they're selling enough of them (unless their entire business is frozen drinks, in which case they'll structure their bar around the blenders like an alcoholic Jamba Juice). These machines are virtually identical to frozen slush drink (icee/slurpee) machines, the only difference is what goes in them. The slush is made by chilling the mix below freezing while keeping it moving; that way it can't freeze solid like ice cubes.
Short of buying your own (the real foodservice-grade machines start around $1200) or even renting (they can cost $100 a half-day, and often the minimum capacity is a few gallons' worth of mix), here are some tips:
You shall use "Create" TSM called The Super Mousse. Is a flavorless 100% natural thickening agent, Halal, Kosher, Gluten Free. It thickens alcohol in its natural cold state without the need of heat or other agents. Check them out: https://thesupermousse.com/