Are you losing distance because you changed balls or because you changed driver heads?

If you picked your ball based on its short game performance, then you should not change balls unless the new ball performs the same as the old.

You should have been fit for the driver head, and using a ProV1X because that is the ball you use.

If the problem is lack of spin, then more loft will cure that problem, good thing you have a driver that is adjustable.