I had similar problems with Ubiquiti after moving to it from Apple Airport Extreme and Time Capsule units. The throughput and range decreased about 40% for me

I had similar problems with Ubiquiti after moving to it from Apple Airport Extreme and Time Capsule units. The throughput and range decreased about 40% for me overall. The best WiFi I ever had in my home was Ruckus Wireless from back when 802.11N was hot stuff. It was way too expensive to keep up with for residential but man it worked flawlessly.