New Air Temp heat pump dripping water from inside coils

New to forums so I will try to be specific. Any help would be very appreciated. I have a new Air Temp heat pump. 5 ton, 2800 sq ft two story home in Alabama. I am having an issue with the coils dripping inside. There seems to be more water forming on the inside coils than can drain into the drain system. The installer came out and we took the panel off the inside to access the coils and water was running down into the side drip trough and out the drain, but some of the droplets on the coils were so large that they fell to the floor underneath. Obviously this ruins the filters as well as building up to the point that it runs out into the room. That is not acceptable. The installer did find a freon leak in the outside unit which he repaired. That seemed to help, but did not totally solve the problem.

The unit backs up to a concrete block wall that was partially open to the underside of the house. A friend suggested that the unit might be pulling very moist air from under the house and there is just too much moisture for the system to handle. I got under the house today and stuffed insulation to stop this possible airflow. I'll see if that helps.

Anyway, if any of you guys have an suggestion or answer, I would appreciate it.