Freeze-ups usually indicate it is large of a system. It is cooling too fast, so it runs too little, and this prevents the humidity from being taken out of the air. You could probably add an extra dehumidifier in the house and this could help. I would also run ceiling fans to help circulate the air.
I have a large house like you have and have a 5 ton and a 2 ton. The 5 ton is a Trane (put in in 2006) that takes care of most of the house and the 2 ton is a Carrier that covers the bedrooms at night. Both are good systems, but I might replace the Carrier with a Trane if it ever breaks down. When I put in the Trane I replaced the entire system with new including all of the lines and the condenser because I didn’t want to be dealing with pinhole leaks.
Great info, thanks very much from a fellow Zombie Hunter @5.56
G