Just to be clear, the issue doesn't have anything to do with FD parts specifically, in fact our setup will wear the tires less than other brands lowering kits since we tend to lower the car in a way that gets the alignment less out of whack. We just got a call from a customer that installed a competitors kit on a newer car and wishes he purchased ours so that it would be closer to the spec of his last car that had an FD Spring Kit installed that worked well for him but the shop he used had another brand in his quote and so he went forward with it and was calling for advice on how to help correct it after the fact.
The concern when lowering is that you're going to get more negative camber, which is fine if it's not too much more. We generally have the sweet spot covered that will not lower the camber too much and will not cause excessive tire wear. Typically you should get a better alignment spec than is being posted here and our initial guess is that the shop may not be doing all they can do to correct the camber to it's best result or there are other factors at play such as worn bushings. It's definitely worth taking to another shop to see if there is more that can be done.
Typically what you're going to want to do after lowering (Springs or Coilovers) is adjust as much negative camber you can out of the alignment (front and rear), then you make sure it's even on both sides (L&R), then you adjust the toe to be closer to neutral (compared to the aggressive factory spec) as Jason mentioned and that's the best you can achieve without further modification to the car. Usually, this is going to work out well for you and while you will get some more wear compared to stock height, you'll also get a bit more bite in the corners and improved handling (it's a balance between wear and handling). This car is known for wearing tires quickly, it's just part of owning a Maserati but it's also part of why it sticks to the road pretty well for it's larger size.
Hope that helps and as always, feel free to reach out for any help!
Best Regards,