The issue of whether or not the owner is taking an excessive tip credit is between the employee who is earning the tips and the owner. If you weren't in Florida, you might be able to report the issue to a state agency for investigation even though you're not the affected employee, but you're in Florida so... you have no state agency and the federal DOL is not going to involve itself with an employee who earns well above minimum wage.
Let's say the manager makes $1,000 per week, and earns $500 in tips which go to the manager. Let's say that were changed to @$500 per week, with the employee keeping the $500 in tips. Under the revised relationship there would be no issue -- the manager would be entitled to wait tables and keep the tips she earns through that direct service.
The fundamental issue is that you would prefer to work at a restaurant where the waitstaff gets more tables per shift -- and that's understandable. But unfortunately, that's something that is not likely to occur at your present restaurant unless business picks up, because a manager is permitted to wait tables.

