Slow speed even with high Tx rates

Have "gigabit" internet at a clients house, speed is 700d/900u via a wire from the computer to the switch.

When connecting via WiFi on 5Ghz with 80Mhz channel, Tx rate on the laptop shows as 780, even with that, speed tests max out at around 300. Any ideas? This is the same for 3 APs in the same site, different channels. I know wireless data rate is never same as the Tx rate but <50% seems very bad. Is it a firmware issue?

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